I think the scales look great! I love the way the edge hightlights fade into the shadows in his lower back.
If you want it less dirty/dry though, maybe try something a bit more colorful for a highlight? The light gray / white can chalk up a bit making it seem dusty I think, but it depends on what you are aiming for. If you tint it a blueish shade you might get a cold-scaled look.
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