I'm doing another CG Workshops course called Mastering Animals. Learning to draw animals means studying their structure, so that means drawing heads and skulls from photo reference. I'm also enjoying the digital painting! And fur brushes. Fur brushes are nifty.
I wanted a horse head and skull in a similar orientation, so I found the horse above on this site: Horse drinks beer to cure colic. (Heheheh)
The skull reference on the left is by CitronVertStock.