One very important tip is always make sure your render or stock is high quality because if it isn't it can really effect the out come.
you are getting better, i like the idea, but like said, the focus of your point is the render here, you want it to be clear/sharp!
I like the lighting, maybe a few touch ups; no biggie though. Render looks a little blurry. Also, the background looks a little bland. Not bad, though.
for some reason, I like this...the theme of the tag fits really well with the style u used...it has a lot of potential but is kinda ruined by the low quality...nice job tho