Thanks, there's a bit of an inconsistency as in some other drawings of him, he only have the pair of rings on his shoulders but not the ones one his chest, but that could be justified as him wearing a different jacket.
I typically use references when I draw, usually screenshots of 3D models in Gmod, for example on the left I used a picture of Miles Edgeworth, (which is why he's built like an ace attorney character in the right image.) I typically copy the way that the reference image is shaded, and I like to keep it simple, not using more than 3 or 4 shades of the same color.
Thanks for the tips on the hair too, I usually try going for a highlight outline, and have smaller lines that follow the outline, then more random ones sprinkled in the middle, which is a bit difficult to not make it look too cluttered since most of my drawings are pixel art.