Airedale
"@Sonata Dusk":/forums/dis/topics/where-are-you-coming-from?post_id=125#post_125
Unsure if I can link here, but there's sthgbooru from /sthg/ that maybe gets something every two or three days, as well as another abandoned booru. Danbooru also has a tag for Sonic, about 8k posts right now. There's also Tailskicksass which has a separate section for art, a lot of it being particularly dated, although there's no tags and you have to go through all the artists' works individually.
Unsure if I can link here, but there's sthgbooru from /sthg/ that maybe gets something every two or three days, as well as another abandoned booru. Danbooru also has a tag for Sonic, about 8k posts right now. There's also Tailskicksass which has a separate section for art, a lot of it being particularly dated, although there's no tags and you have to go through all the artists' works individually.