The one thing you might want to work on is probably line-art. Excuses like, "I'm using a mouse!" Or, "But I just got my new tablet!" aren't good enough. =P I use a mouse. But anyway.. Lovely peice. I think it could use a bit more shading. ALWAYS focus on the darker parts of the body and shade appropriately -- it may not look nice at first, but when the peice is finished, it turns out lovely.

Great job on a first try. =) The nails are wonderful. Be sure to add shine to them when you can.