Of your work so far, I think I like this one the best.
You have come a long way since your early work & you've done a good number of details well. - the face esp., shading, blending the char into the background, detail on the clothing, etc.
I would only suggest that the hair is still a touch to rigid. You might consider some "rogue" :p strands. The shading on the hair is done well - just under the ear it might need to be a little darker to match the shade on that shoulder. (mind you I have lots of trouble with shading)
Also the hip area might need to be a little more smoother & rounder so that the screenshot model is less obvious.
Just some suggestions - but this is really good & very promissing. Keep up the good work & the Wacom Tablet kicks but!
Giolon, if I'm not mistaken, a Wacom is a pressure-sensitive plate used for drawing and editing pictures with more precision that you can get with a mouse.