Fix the spec on the casing of the bullets, the spec should inherit some of the colour of the diffuse. Use the pic you posted yourself as ref. Other than that, this looks ace :)
I'd push the plastic more. You've got a *great* texture but I think there is still a bit to go to hit the sweet spot. Some ideas: - Run generic black/white noise, run through nVidia filter, and overlay onto plastic. It'll help roughen up the plastic a bit more. - Try to pull out the peaks of the material a bit more. In the…