Heyo do you have any other reference shots of the camera? Right now I'm feeling like your edge chipping is a bit too uniform. I'm really liking the thumbprints. The material separation is nice, but I think the weakest part right now is the large flat backside of the camera, it might be too much noise there? Also i'm not sure what that circle is in the back, but if its something that is pressed there would be more wear and tear in that area.
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https://www.artstation.com/artwork/18LX6o