I would say you definitely displayed what you were trying to achieve here greatly. There is no question about what you were trying to do at all.
As far as originality goes, I'd say it is pretty original you do not see this type of thing very often, but the gun may be too close to it's reference in similarity.
You're technique is great but I must say more contrast of lights and shadow would be helpful with the depth. Also the fingers do look somewhat odd, the pinky fingers anyway. The other fingers are fine. Simply shade a bit harder next time, and put some slightly more harsh highlights.
Overall this piece is exceptional, the depth is the only real flaw here. If you were to do as I said earlier, and maybe get a little more contrast in this, it would work better.
Umm, I can't do a critique (no Premium Membership) but I can still make a detailed comment.
Well, first thing that comes to mind is that her skirt is VERY poofy, almost like a Princess' dress. That's a bit much in my opinion, but I will defer to you for reasoning. The wavy folds are very well done, and I can see them in motion as she whips out them pistols.
The guns and hands are very nice, and I can see her having very sensitive hands for cleaning delicate objects. The guns have nice detail, though I'm fairly sure they normally have some more color on them. Whatever works. The glasses are a tad silly, but seem to be put to where she can look more closely at something while cleaning or inspecting it. Nice touch there. Not sure what the headgear is for.
Also, the P.O.V. of the art gives to mind that whoever she is whipping out her guns to shoot is parkouring over something, hence the angle. Also, she seems to be a bit happy for being ready to kill someone. Sociopath much?
The guns seem a bit too big for her hands. Plus... Where would she hide them? A discrete 9 Millimeter or a USP .45 would fit better than those beasts. Hm... Now that I think about it... She looks too tech savvy to rely on sheer stopping power. Maybe a machine pistol? Something like those G18s from Call of Duty: Modern Warfare 2. Here is one you might like: [link]
Sorry, I'm kind of a stickler for detail when it comes to guns. I know one thing for certain. Long barrel, high caliber, pistols like those are heavy. Keep that in mind. If you have a petite character, they definately won't be lugging around Desert Eagles or Magnums... or Beretta 92FS's. Too much extra weight. Plus, the recoil on those things would cause massive wrist damage if fired improperly. There are plenty of small guns yet lethal guns out there. Explore those options, instead of just going for the Big Guns.