Update on this. I've updated the arm and added it to the scene. Edit: pic update of the scene. Bit unsure on the placement, at the moment it seems to be blending in with the pipes behind it, will need to sort that out.
Abandoned lab looks cool, though the ambient lighting should imo be much lower. Right now the center piece, the chair, kinda blends into the background lighting wise.
You need padding on both your normals and diffuse(and all other maps, spec etc). It looks like the black background from your diffuse is bleeding through.
If you're using Marmoset, you'll also have to change the blend mode of the shader. Alpha and Premultiplied Alpha are what you're looking for. They're both useful for different stuff.
I second this, and think it's more or less exactly what you were looking for. Be sure when generating the cavity map to set the method to EMB (emboss) and then blend it with overlay.
Donated $10 to you :) . My progress haha http://au.movember.com/mospace/993766/ Problem with being a bright red ranga is that the mo kind of blends into my skin a bit.
Great work and beautiful colors combination. I haven't used Procreate for a while, but the only problem I had transferring files to PS was with some of the layers blending modes.