I dont know about your best, its about the same as your 'favourite' tag you have in your signature, but there's still alot for you to learn and improve on. Id suggest making sure watever stock you use as your focal point, fits on your canvas, as the tag you've just done, the stocks chin is cut off at the bottom. its just a simple resize once you have your image cut and pasted. click on the layer, ctrl > t, make it smaller, hit enter and your done. a corner that simple shouldn't be cut.. and also, wen making your backgound, as you get better, its almost like your making an evironment for the stock you use, blurring the background creating more depth and improving quality. But even in fictional looking tags, a realistic depth of field always looks best (look at Xed's tags for examples of what im saying, the stock looks like its always been with the graphics around it and not previousely cut from another image), keep at it man, you'll get there in time.
Yeah, the chinless render doesn't blend, because the BG doesn't seem to fit with her, as the colors don't go well with each other and it doesn't create that sense of movement OneTwo talked about. But you'll get there soon mate : )
I do like your background and text, i dunno i just dont think the stock fits in place with the theme.
I agree with the above. I think it looks good, but the perspective got tweaked cause of the way you fit it onto your canvas. Still, That's an easy fix next time. Not bad mate.