Thanks Eishiya. You've got a point there. I'll try it. The thought behind the skin's dark edge is to turn the skin into a layer with a bit of thickness. It's not a dropshadow, but your suggestion might work better visually.
The shadow being on the skin makes it look like the metal parts overlap the skin. If it's meant to look like the skin is on top of the metal parts, then the shadows should be on the metal instead.
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Thanks Eishiya. You've got a point there. I'll try it. The thought behind the skin's dark edge is to turn the skin into a layer with a bit of thickness. It's not a dropshadow, but your suggestion might work better visually.