The only thing that I can notice faulty with the girl is how wide her shoulders are compared to the rest of her body and also how the body is a little off. I feel that the size of her head and shoulders should make her about 3 inches taller, a couple of inches wider at the hips, arms, midsection, and legs.
The guns themselves don't look that great. The clip that comes out of that gun is way too small for how long you have made the chamber. It's almost like the guns were made backwards. Even the smallest guns are just as long as they are tall.
The quality of the girl is done well though. What you would expect for the style that you used. I personally wouldn't mind seeing the character put into some sort of background such as a street or an alley. (Even though it was a character design it's nice to see where the character would be)
Also, what's up with the quality of the picture? It's a little low for what you would expect photoshop to export. On top of that the words on the picture are slightly too small to read comfortably unless viewed in full size. The background is actually nice, but like I said I would enjoy a scene better.
All around a decent picture, but I feel that the ratios are off a bit.