I think he wants to know how well he did, rather than how he did it. As in, he is looking for critique. That said, it looks nothing like a drawing, and more like a low poly model with bad textures and a bad render.
Looks good as a drawing, except the area below the barrel, in front of the trigger. If this was a model, I'd say your smoothing groups are f'ed up. The reflectivity kind've dies, when it should become a little stronger, imo.