Okie, I think I'm getting somewhere here. The illusion of reflective surface has been earlier done via manually painting the skin with dodge & burn tools. This can be kinda tricky for some who have their thumb somewhere else than on their hand (like me). Sooo, what I did was, that I used 'Diffuse Glow' & 'Plastic Wrap' filters of Photoshop to make the skin VERY bright. By scaling down the opacity of the filter layers, I came up with kinda shiny metallic look. I only tested this with the blue P40M SS skin we have, but I think that by making the base color of the plane to medium grey, the two filters would make it look just like aluminium. :hmm:
Anyways, here's a shot of the P40M.
BEFORE
AFTER
Okie, back to work.