Lazy does win. But apparently you’re not very good at being lazy.
If you had searched you would have found two threads on the very first page, one linking to a 3rd Strike site with all the 3rd Strike portraits, and one linking to a GGXX#R site with all the character art, endings, and portraits. And if you had been to the sticky, you would have found a site that had tons of CvS2 artwork.
“Nothing good”, yeah right.
I’ll help you out anyway though, because I have a feeling you won’t learn anything if I don’t. Look for the topic “The GGXX#R Sprite thread”, don’t worry it’s on the first page, not hard to spot, there Sir Plus links to a good site on the last page. Also look for “ah, that cool flash site w/ 3s sprites is gone!”, also on the first page, and there felineki links to a good site on the last page.
There’s character art for CvS2 all over the place, but if you try some of the sites in the sticky like SonicHurricane (HINT HINT) you might find what you’re looking for pretty quick.
And if you’re looking for fan art or comic book art, I suggest you try the Fan Art Gallery section or Street Fighter Comics section. There’s quite a lot of very high quality character artwork to be found in both sections. There’s even a very large thread going on right now for character art in the Fan Art section.