I remember this
I think there was a contest or something about a little girl with a big gun. If so, then I think you probably have won. It helps that you have such a great background here and such a strong emphasis on the weapon itself. I especially love the way the part of the gun creates those little white and yellow sparks. And yes, it helps that this character has some pretty nice breasts and a good body. I, of course, appreciate this mostly for the strong colors being used.
Vibrant colors are something that I always look for in art pieces. I may have been here too long, but I kind of think the girl looks like Nene. I bet you had a lot of fun putting so much detail in this. I can always look at this and notice new things, like how there's a broken street light. The shading is very well done, something I always look for too.