Adjusted the material a little bit, as well as the diffuse and normal maps. Attempted to get rid of that plastic-y sheen. Let me know if this is working better.
Thank you guys very much for the help, I have added some grunge to both the diffuse and spec maps as well as softened up the AO. I am glad I posted here.
Nice models with pretty clean texture maps! Why don't you put some green color on the diffuse map? especially dark part. Gave some green color on your spec map is nice but it doesn't look enough to showing color variation.
This is good. The only thing that would make it better is if it had some slight color variation. Some parts of your reference has a slightly darker diffuse on it and it would help break up the overall one tone surface. Your specular also has one tone on it, play with the brightness of each one so it doesn't have one…