Yay! I actually coloured it!
I just finished this tonight. It's the most detailed landscape I've ever done on the computer! The rocks looked awful, so I just took the texture from his hair and put it on the rocks! And I made the wall look smoother too.
Overall I'm quite pleased with it.
The original drawing is here: [link]
This one's a good deal smaller than the original. It would've taken me ages to colour the huge one.