You need to crop and transparentise your dolls; there's a tut here
on how to do this.
Nice for a first try at shading; the hair needs to be stranded, and the folds need to be more organised. A good way to see how clothes fold is to look at photographs, or even your own clothes on you in the mirror. Hayley has a good, easy to follow tut on shading, found here
You also forgot base credit; that's very important. Best thing to do is to save the site you got the base from to notepad, then you won't forget where you got the base.