I prefer the eyes as they are (as opposed to Lawrence's edit), as that edit makes them kinda' huge and I like the dark shadow around them.
Pretty cool piece, but my first impression of it was that it's a little "fuzzy" with all that AA (basically the AA extends too far out from the sides of the image) and perhaps the tail could be a little less jaggy.
i really like the minimalistic style of the face.. really cute
but what this piece needs is a cleaner (and effective) aa.. at the moment it's just awful, sorry. looks like you didn't aa the black outline, but outlined the outline with another outline: you should do aa only where you have steps in the black outline and you could use the dark brown to aa the of the inner side of the black outline.