I'd say pretty good job on the models. If you take any of my advice, take it with a metric ton of salt (as I also am a noob).

The AR bitmap doesn't look like its from any of the games, FP model of the pistol just looks a bit bulky, the bitmap for the sniper looks like wrong (I would say contrasted/saturized, but I'm probably misusing that), and the Spartan Laser bitmap looks a bit fuzzy (low resolution).