Yet another old one and mostly just a repaint. I did add some drawing pin point ends into the tips of his fingers to give his claws a nice sharp look, it also means he has actually scratched people when they handle him.... I also painted his eyes all dark brown, no whites, I thought this made him appear more feral and animalistic.
On all my customs I use a bit of gloss paint on their eyes, as this seems to bring them to life.
I mostly use Games Workshop paints - I painted Warhammer stuff since I was a wee laddy, so already had hundreds of their paints, but I use a few Vallejo acrylic paints for some of the colours that GW just can't seem to do well (golds, yellows).
I also fill all the peg holes up with milliput to hide and smooth the sculpt flow.