diff --git a/gallery_dl/extractor/artstation.py b/gallery_dl/extractor/artstation.py
index f8f463fb..c034d536 100644
--- a/gallery_dl/extractor/artstation.py
+++ b/gallery_dl/extractor/artstation.py
@@ -64,7 +64,7 @@ class ArtstationExtractor(Extractor):
                     if "/images/images/" in url:
                         lhs, _, rhs = url.partition("/large/")
                         if rhs:
-                            url = f"{lhs}/4k/{rhs}"
+                            url = f"{lhs}/8k/{rhs}"
                             asset["_fallback"] = self._image_fallback(lhs, rhs)
 
                     yield Message.Url, url, asset
@@ -103,6 +103,7 @@ class ArtstationExtractor(Extractor):
                          adict.get("id"))
 
     def _image_fallback(self, lhs, rhs):
+        yield f"{lhs}/4k/{rhs}"
         yield f"{lhs}/large/{rhs}"
         yield f"{lhs}/medium/{rhs}"
         yield f"{lhs}/small/{rhs}"
diff --git a/test/results/artstation.py b/test/results/artstation.py
index c7f6c524..4a095d0c 100644
--- a/test/results/artstation.py
+++ b/test/results/artstation.py
@@ -5,68 +5,62 @@
 # published by the Free Software Foundation.
 
 from gallery_dl.extractor import artstation
-from gallery_dl import exception
 
 
 __tests__ = (
 {
     "#url"     : "https://www.artstation.com/sungchoi/",
-    "#category": ("", "artstation", "user"),
     "#class"   : artstation.ArtstationUserExtractor,
-    "#pattern" : r"https://\w+\.artstation\.com/p/assets/images/images/\d+/\d+/\d+/(4k|large|medium|small)/[^/]+",
+    "#pattern" : r"https://\w+\.artstation\.com/p/assets/images/images/\d+/\d+/\d+/8k/[^/]+",
     "#range"   : "1-10",
     "#count"   : ">= 10",
 },
 
 {
     "#url"     : "https://www.artstation.com/sungchoi/albums/all/",
-    "#category": ("", "artstation", "user"),
     "#class"   : artstation.ArtstationUserExtractor,
 },
 
 {
     "#url"     : "https://sungchoi.artstation.com/",
-    "#category": ("", "artstation", "user"),
     "#class"   : artstation.ArtstationUserExtractor,
 },
 
 {
     "#url"     : "https://sungchoi.artstation.com/projects/",
-    "#category": ("", "artstation", "user"),
+    "#comment" : "alternate user URL format",
     "#class"   : artstation.ArtstationUserExtractor,
 },
 
 {
     "#url"     : "https://www.artstation.com/huimeiye/albums/770899",
-    "#category": ("", "artstation", "album"),
+    "#comment" : "'Hellboy' album",
     "#class"   : artstation.ArtstationAlbumExtractor,
     "#count"   : 2,
 },
 
 {
     "#url"     : "https://www.artstation.com/huimeiye/albums/770898",
-    "#category": ("", "artstation", "album"),
+    "#comment" : "non-existent album",
     "#class"   : artstation.ArtstationAlbumExtractor,
-    "#exception": exception.NotFoundError,
+    "#exception": "NotFoundError",
 },
 
 {
     "#url"     : "https://huimeiye.artstation.com/albums/770899",
-    "#category": ("", "artstation", "album"),
+    "#comment" : "alternate user URL format",
     "#class"   : artstation.ArtstationAlbumExtractor,
 },
 
 {
     "#url"     : "https://www.artstation.com/mikf/likes",
-    "#category": ("", "artstation", "likes"),
     "#class"   : artstation.ArtstationLikesExtractor,
-    "#pattern" : r"https://\w+\.artstation\.com/p/assets/images/images/\d+/\d+/\d+/(4k|large|medium|small)/[^/]+",
+    "#pattern" : r"https://\w+\.artstation\.com/p/assets/images/images/\d+/\d+/\d+/8k/[^/]+",
     "#count"   : 6,
 },
 
 {
     "#url"     : "https://www.artstation.com/mikf/collections/2647023",
-    "#category": ("", "artstation", "collection"),
     "#class"   : artstation.ArtstationCollectionExtractor,
     "#count"   : 10,
 
@@ -85,7 +79,6 @@ __tests__ = (
 
 {
     "#url"     : "https://www.artstation.com/mikf/collections",
-    "#category": ("", "artstation", "collections"),
     "#class"   : artstation.ArtstationCollectionsExtractor,
     "#results" : (
         "https://www.artstation.com/mikf/collections/2647023",
@@ -105,20 +98,17 @@ __tests__ = (
 {
     "#url"     : "https://www.artstation.com/sungchoi/likes",
     "#comment" : "no likes",
-    "#category": ("", "artstation", "likes"),
     "#class"   : artstation.ArtstationLikesExtractor,
     "#count"   : 0,
 },
 
 {
     "#url"     : "https://www.artstation.com/contests/thu-2017/challenges/20",
-    "#category": ("", "artstation", "challenge"),
     "#class"   : artstation.ArtstationChallengeExtractor,
 },
 
 {
     "#url"     : "https://www.artstation.com/contests/beyond-human/challenges/23?sorting=winners",
-    "#category": ("", "artstation", "challenge"),
     "#class"   : artstation.ArtstationChallengeExtractor,
     "#range"   : "1-30",
     "#count"   : 30,
@@ -126,7 +116,6 @@ __tests__ = (
 
 {
     "#url"     : "https://www.artstation.com/search?query=ancient&sort_by=rank",
-    "#category": ("", "artstation", "search"),
     "#class"   : artstation.ArtstationSearchExtractor,
     "#range"   : "1-20",
     "#count"   : 20,
@@ -134,7 +123,6 @@ __tests__ = (
 
 {
     "#url"     : "https://www.artstation.com/artwork?sorting=latest",
-    "#category": ("", "artstation", "artwork"),
     "#class"   : artstation.ArtstationArtworkExtractor,
     "#range"   : "1-20",
     "#count"   : 20,
@@ -142,16 +130,14 @@ __tests__ = (
 
 {
     "#url"     : "https://www.artstation.com/artwork/LQVJr",
-    "#category": ("", "artstation", "image"),
     "#class"   : artstation.ArtstationImageExtractor,
-    "#pattern"     : r"https?://\w+\.artstation\.com/p/assets/images/images/008/760/279/4k/.+",
+    "#pattern"     : r"https?://\w+\.artstation\.com/p/assets/images/images/008/760/279/8k/.+",
     "#sha1_content": "3f211ce0d6ecdb502db2cdf7bbeceb11d8421170",
 },
 
 {
     "#url"     : "https://www.artstation.com/artwork/Db3dy",
     "#comment" : "multiple images per project",
-    "#category": ("", "artstation", "image"),
     "#class"   : artstation.ArtstationImageExtractor,
     "#count"   : 4,
 },
@@ -159,7 +145,6 @@ __tests__ = (
 {
     "#url"     : "https://www.artstation.com/artwork/lR8b5k",
     "#comment" : "artstation video clips (#2566)",
-    "#category": ("", "artstation", "image"),
     "#class"   : artstation.ArtstationImageExtractor,
     "#options" : {"videos": True},
     "#range"   : "2-3",
@@ -185,7 +170,6 @@ __tests__ = (
 {
     "#url"     : "https://www.artstation.com/artwork/g4WPK",
     "#comment" : "embedded youtube video",
-    "#category": ("", "artstation", "image"),
     "#class"   : artstation.ArtstationImageExtractor,
     "#options" : {"external": True},
     "#pattern" : r"ytdl:https://www\.youtube(-nocookie)?\.com/embed/JNFfJtwwrU0",
@@ -195,27 +179,23 @@ __tests__ = (
 {
     "#url"     : "https://www.artstation.com/artwork/3q3mXB",
     "#comment" : "404 (#3016)",
-    "#category": ("", "artstation", "image"),
     "#class"   : artstation.ArtstationImageExtractor,
-    "#count"   : 0,
+    "#exception": "NotFoundError",
 },
 
 {
     "#url"     : "https://sungchoi.artstation.com/projects/LQVJr",
     "#comment" : "alternate URL patterns",
-    "#category": ("", "artstation", "image"),
     "#class"   : artstation.ArtstationImageExtractor,
 },
 
 {
     "#url"     : "https://artstn.co/p/LQVJr",
-    "#category": ("", "artstation", "image"),
     "#class"   : artstation.ArtstationImageExtractor,
 },
 
 {
     "#url"     : "https://www.artstation.com/sungchoi/following",
-    "#category": ("", "artstation", "following"),
     "#class"   : artstation.ArtstationFollowingExtractor,
     "#pattern" : artstation.ArtstationUserExtractor.pattern,
     "#count"   : ">= 40",
@@ -224,21 +204,18 @@ __tests__ = (
 {
     "#url"     : "https://fede-x-rojas.artstation.com/projects/WBdaZy",
     "#comment" : "dash in username",
-    "#category": ("", "artstation", "image"),
     "#class"   : artstation.ArtstationImageExtractor,
 },
 
 {
     "#url"     : "https://fede-x-rojas.artstation.com/albums/8533110",
     "#comment" : "dash in username",
-    "#category": ("", "artstation", "album"),
     "#class"   : artstation.ArtstationAlbumExtractor,
 },
 
 {
     "#url"     : "https://fede-x-rojas.artstation.com/",
     "#comment" : "dash in username",
-    "#category": ("", "artstation", "user"),
     "#class"   : artstation.ArtstationUserExtractor,
 },