I worked 11 hours on my "Asian Woman" pixel portrait. It took forever to get the correct shading styling that looked best to me. I think there has been a mistake. I am not going to revise my work, since I am very happy of its current state.

This is the piece in question:

  

Not that I think it's bad or anything, but this seriously took you eleven hours?
I can understand why this was rejected, because it looks more like oekaki than pixel art to me. Perhaps one of the other mods will agree that it was mistakenly rejected, but if not, you're just going to have to deal with having a rejected piece in your gallery. If you don't want to revise it then that's your problem.