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avoid the noise!!!! one thing i notice with some peoples textures is that they are way too noise avoid tons of small detail, what makes metal look like metal is grainy areas complimented by larger smooth areas. Seriously take a look at that hard surface texturing tutorial posted earlier. adding some smooth paint on top of some of the trim areas could work wonders.
Also make sure you are using layers effectively. try to imagine how all the elements are layered in real life and your texture should almost match it, but not always. for instance your caution tape should be on the top layer, and instead of painting the metal on top of it, erase or mask off areas you want to be peeled away, its much more realistic doing it like that and will help you when you go to create normals or specular maps.
Dont just dodge highlights for corners use a grey or some sort of base color to make it look like scratched areas. And dont paint in light information. It might seem hard at first but eventually you will get used to it. If you want to simulate depth use the inner/outer glow effects so that everything is uniform. Remember this is a flat texture there should not be any light direction.
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