This video completes the slate study by adding texture and polish.  Though there are many approaches to adding texture in digital painting, this time we won't be using any photos.  Instead, the surface texture is created with a modified custom brush.

Additionally, the rock's sharp edges are softened a bit by modifying the group's mask.  Both of these techniques are uniquely digital, so make sure to watch the videos linked at the right if you're unfamiliar with the tools.  

AuthorMatt Kohr