nice drawing overall. like the pose and the way everything is drawn and the shading is solid too but it does seem to be all over the place to me. try and think about your light source and the direction as to where its coming from and then shade from the sides of the character that are farthest from it and other places you might think need some shading like inner ears, chest, muzzle, hair spines on her head, etc. still very nice drawing I must say!
A very magnificent picture of Amy! I really love her pose and expression! Love her Piko Piko Hammer too! The outlines, the colouring, the shadings and the shadow behind her are so wonderful and fantastic! ^^