Man, that is looking fantastic! Good to hear you got the maps pretty much sorted out, should be sweet to see him posed.
My only crit at this point is the holes, they definitely are looking more organic, but giant holes in a realistic body just seems so off putting to my eyes. I realize you are probably practically finished, but it may be worth looking in to other ideas for steam vents, so to speak. Maybe have fleshy areas that open up and contracts and such. Lol, this is going to sound weird what I am about to reference, but it is the best thing I can think of at the moment (I am tired ok! lol) but, at this point in time, I am imagining them as almost…
sigh
rectums… LOL. but obviously looking suitable to the area they are places. But the idea of contracting and opening would work the same.
That or have it mechanical vents.
:shrug:
I dunno, just some ideas of a tired man. 
Either way this is looking VERY slick. :applause: