Danbooru can be any artwork that falls under the guidelines, no matter how westernized the artwork or its subject matter can be.
What? ''Uploading Guidelines'' clearly doesn't say that, Western style illustrations are generally not accepted on Danbooru.
Art Style
Danbooru is an Anime Art Gallery first, and a high-quality gallery second. Only anime-style art will be accepted. Art which is done in other styles is highly likely to be rejected.
Generally Accepted
Anime-style illustrations.
Anime-style renditions of characters from Western animation or comics.
Photography of Anime-themed papercraft. Examples: paper_child
Conditionally Accepted
Doujinshi (especially long doujins covering many pages), must be a high quality untranslated raw. Please make it clear that you are uploading a long series if you have a download limit by grouping the pages into a pool.
Generally Rejected
Most Photography.
Western style illustrations (commonly known outside Danbooru as 'cartoons' or 'comics').
Note the "generally". Which means that sometimes, well, sometimes shit happens.
Yeah, but it clearly doesn't translate into ''any'' artwork, those are exceptions, not the rule. Especially not ''no matter how westernized the artwork'' part.