Thanks, but I don't think it's talent that separates us much. Just experience really, IMO. Your drawings look stylized, which is cool. I have a very difficult time doing stylized stuff, but I'm not sure if that's what your going for in this drawing or if that's just your style as of now and your aiming at a more comic style look.
I'm going to assume you're aiming more of a comic/realistic (comics realistic? LOL) look. Starting from the top, I would make the headgear look fuller. By that, you don't have to change the drawing really, but more so on the lighting/coloring. Remember that her hair is supposed to be in that headgear, so they should be more cone shaped. As of now, because of the coloring, they look really flat, like the corner of a paper folded down.
The face looks great, that's one of the top 3 tougher parts to draw. I would try to see what the face would look like with the closed eye having the lashes facing downward rather than upward. The bottom eyelid doesn't really move at all.
Next, add some volume to the white neck ornament thing she wears (sorry, I dont know technical terms). It should have a little bit of volume, but in the drawing iits skin tight over her breast/chest.
Moving on, add some lats (back muscle) to the shoulder pointing the gun to give her a fuller back.
Next, I would make the gun hand (and gun) bigger to give it a stronger perspective that it's popping out towards the viewer. The gun looks fine, but don't forget that it's a revolver, so you need to draw the revolver mechanism that holds the ammo/rounds. Also, I would rework the shading on the tip of the barrel. Don't forget to add her thumb and the frilly white stuff on her wrist too!
The legs look fine as is, but they do look a little flat due to the simple lighting/shading your using. Same with the feet. A more complex shading would make it look more fuller.
Jut a question, are you trying to avoid using black line art in your drawing? also, what program(s) do you use?
None of these critiques/suggestions are meant to be degrading in any way. I normally don't critique unless I see artwork from people like this. I can see that it's good work and are close to making a breakthrough to some better drawings.
Thank you very much for these great advices. Well, i'm lazy and have no experience with coloring (nor drawing on PC; I use the Gimp. no lineart, a lot of photoshopping, not much drawing) that's why the ''reflections'/'shadows' etc are minimalistic, basic, unrealistic etc... there was a lack of motivation too but thanks to your comments i will improve it.