Basically if you want to get better just set your standards (too) high and keep practicing. Also look at all the models on CMON and see what general ideas you can pick up from those, that can be quite helpful. The main thing I think this guy particularly needs is more contrast. Darker darks, lighter lights. It looks like you've blended between about 2 shades in the blue areas; don't be afraid to use more. Detail on metal would be good too (you've highlighted everything but the metal).
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