Yeah, I can see you put some work into this. It looks very good! Wellll, if you're looking for tips on metal skin, check out these couple of good free tutorials in the HM's store section: Optical Intruder's Metals Tutorial and Jr. Mc Death's Steel tutorial
If anyone knows a good tutorial on how to make easier metal skin, id be glad to know it btw. This one was major filters, contrast, smudging and blurring within like 25+ layers lol