You can post pretty much whatever you want. You may not see a lot of Pixel Art here, but you can use your gallery as a portfolio if you want. Moving or leaving is not necessary unless you're here just to be commissioned.
All forms of art may be appreciated, I see no problem with Pixel art; I also do Pixel art sometimes, but not hentai ones, so I don't upload these as I prefer to keep my gallery as portfolio solely for hentai or near hentai.
If you feel your art is not like wow, such popular or related, you may just upload things here as an alternative gallery and keep posting somewhere else; I see no problem with Pixel art.
You're the one having the last word, though, so you decide if it convinces you or not, I always prefer to have a lot of galleries for portfolio even if I don't use those alternative galleries for main purposes.