Your image is looking good so far, I like the modeling. I would recommend adding a green edge/back light, to help define the shape of the gun better. I feel it’s form is being lost too much to the black background. Making it green will also make the source of the light appear to be from the green laser. I hope this suggestion helps!
What do you think? I’m thinking about puting a gloved hand holding the gun now. at the moment I just have painted in black to give the illusion of someone holding it.
maybe a bit of texture for the background would be cool? another thing which is bugging me is the bottom of the handle showing in the left hand corner. somehow when it dissapears into the black and then reappears, it’s a bit disturbing. maybe if you either have the whole handle visible, or you get rid of the bottom showing through. maybe in ps or something.