its actually well pixelled - well whatever areas that are pixelled at least
btw Darnok and DatMuffinMan are referring to the use of non-pixel frendly tools such as gradients. they arent considered pixel art so the fact that this made it through is weird
just remove the gradients and you should be fine
your piece will certainly be rejected soon due to the obvious gradients..
a recent (good) example how to get rid of the gradients: http://www.pixeljoint.com/pixelart/91511.htm