As discussed in the chatroom:
What i would say is: for the skin...paint the thing like darker..then gradually biuld up to a brigher colour on the edges of the muscles..right now it looks like u
went overboard with teh brighter colours so the transition from dark to bright is soo abrupt. Like for instance..basecoat white..then paint medium brown/grey mix..then grey and less brown..then grey bleached bone
mix..then just bleached bone..then final hilite with white mixed bleched bone...fianlly do a wash of dark grey..and then a wash of dark brown . right now it just looks a bit abrupt. Not bad..but the transitions need to be smoother. The frehand tattoo is nice on the chest. You can also mix it up..a thicker brush for rough tattoos and even a finer rbush added to make a bit finer deatils around
it..makes it look even cooler :)