I transferred the sketch to the watercolor paper and jumped right in with the darks first. I forgot to take photos at earlier stages as I got a little carried away.
I painted the lighter wall with very random brushstrokes and I quite like the subtle texture it created. The darks I painted in full strength with very little water and quite like the texture again but not too sure where I am going with these, I guess this is where a detailed thumbnail sketch comes in handy....hmmm.
The skull has been painted in using thinner layers of paint but I am trying to keep it looser an have the paint not mixed very well on my palette so that the colors are more varied and each color (I used 3 primaries) can shine through in different spots.