Now I'm not a modeler, and TBH I suck at textures too because I'm a bit naff at everything, but I get along with next gen media sets like diffuse/local/spec. I picked a low poly model with Diffuse only because it would be quick and would be a test for my diffuse skills.
The main gripe i have with the texture is that is seems a bit like concrete and its very flat But other than that ill call it done:
No comments to add because they've been said on polycount, what you've got there is really a good base for your normal maps and what not so just the diffuse *will* look flat as the guys over there said.
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Yeah, no lighting? It's not finished without highlights, shadows, etc. Seems slightly grainy for plastic, too - maybe a bit less "dirt overlay" and a few careful bumps and scrapes in the right spots would help that.