I don't post a lot of processes, but here is one.

1- Block out basic values. Don't worry about cleanliness, you can fix it later. This is just how I organize and lay everything out. Use large brushes! (It makes it so much quicker!)
2- Build up values. Don't use small brushes yet, but you can make the brush a little smaller than in the previous step.
3- Now you can add a little more detail.
4- Finishing touches, texture, etc.