PJ has a relatively strict definition of what counts as pixel art: the piece has to be polished at the pixel level. While this piece uses a limited palette and has no automatic smoothing, it's rough at the pixel level, it looks like you just scribbled and blocked many parts in without caring where exactly each pixel ends up. It looks like a solid start to what can become a good piece of pixel art with some more work, but it isn't quite pixel art yet.
Okay, thanks. I'll add more smoothing and change some things.