This was a volcano monster that we had to paint. I painted a basigc shape under the sketch, in a reddish colouring, to represent the dark areas of the magma. I then put the black rock over on a layer above, cutting it away and creating the cracks. I also gave it a bit of texturing too to help give it some more shape. I then slowly brought up the lava brightness till it was almost white., adding glow and such around the lit areas.

I also thought it would be interesting to send the contrast to max, and it turned our rather cartoony.