Ok, been working on this pretty much all day, but I'm glad I've done it - great learning experience

Right, I've not finished quite yet but it's beginning to take shape. I need to blend in a couple of the UV shells better, need to sort out the colour, and tweak the skin in places to look more consistant. I'll be going for a patchy looking skin, if I pull it off it should look pretty decent. Stopping here for tonight :