hey man, great start.....i really feel that you dont need a tie your dirt and grim layer to your normal maps.....it makes it feel like some has shot it with a shot gun peppering the metal with what looks like gouges. If that was the look and feel you were going for then you need almost more supporting texture detail.
but if this is just dirty i feel it is missing an overall dirt layer from like dust and what not....the way it stands now its not very coherent
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ALSO no need to put up 4096 images to a website.
but if this is just dirty i feel it is missing an overall dirt layer from like dust and what not....the way it stands now its not very coherent
did you model it as well?