amazing bit of work! One thing I would like to point out perhaps is that you have the shadow coming from the back of her heels rather than the front of her toes, but the light source is coming behind her. Perhaps if you moved the shadow, so it can from the front of her feet? Other wise, I see very little that could improve this lovely piece of work ^^
Yes that's true! I'm not so able to play with shadows effects! I don't like it so much!!! XD I'm glad that you like it and many thank for your opinion, it's very appreciate! How do you advise me for this problem?
okay then I dont so much photomanipulation but I have so all I can suggest is that (please keep in mind I dont know how you work) make a new layer for everything when you make the 'shadow layer' copy in the picture of the person and any objects they may hold. Make a layer above that and right click and click 'clipping mask'. Then colour over in black. The clipping mask makes it so that you brush will not colour anything else but the space of the object in the layer you 'clipped to' indicated by an arrow on the layer you put the clipping mask option on. Then on the layer you right clicked for the clipping mask option, go to Edit --> free transform and distort the now should be black sillhouette of the charatcter move it and stuff until its in a spot you like. Then remove the clipping mask and drag the shadow layer to underneath the person or object and reduce opacity to that layer and click even blending options like 'multiply' or 'overlay' and play till it looks right for you
If you arent sure about how to place the shadow or where correctly, then check out some reference pics, have a look on the net etc and see what shadows behave like in light etc!
I hope some of this has helped Im not very good at explaining in words
and keep it up, seriously because its awesome! Hope my info can help further your work, because you are doing so damn bloody good already^^