Oh, I didn't think about that, yes I did the rays with opacity layers, for some reason I forgot to think whether or not I should submit it like that... sorry! ^^' Ok, I'll re-submit this once I've cleaned it up...

There are a lot of colours in this piece that are only used for 1 pixel each, mostly in the light rays. It looks like you used automatically anti-aliased shapes and opacity for those, producing all those redundant colours. That sort of thing isn't allowed on PJ, so perhaps you should submit a version without the light rays, or, better yet, a version with the redundant colours and AA cleaned up, since the light rays do look good.