I must say another cool thing about it is that it looks like an eye, the hat being the eyelid. Along with what Takai said, you're not really using the AA very effectively, so it's probably better to take it out entirely and save on the colours, or find an AA tutorial (of which there's loads around) and have a practice with that.
I think the shiney edit to the CD is a good idea. Can't say i think the dithering is a good idea though. Another thing which may help it look more like a CD could possibly be the inner ring part (not sure what it's called) which i can't notice on yours.
Neway, good luck, tis a cool design.