I think it should be colored light blue, like the ref. But if you're leaving it that way, change the background color. It's hard to see it in black.
If the armor is made of something smooth (metal, for example), you need to drop the dithering (unless it's made of rough metal) and increase contrast. But if it's made with fabric, then it's good. Just make the shades a bit more visible. Put a bit of orange on the armor highlight, since the light isn't white.
If the armor is made of something smooth (metal, for example), you need to drop the dithering (unless it's made of rough metal) and increase contrast. But if it's made with fabric, then it's good. Just make the shades a bit more visible. Put a bit of orange on the armor highlight, since the light isn't white.