This is an exercise in speedpainting basically, but this one approach is inspired by Feng Zhu, a concept artist dinosaur recently based in Singapore. He worked on projects like Star Wars III, the first Dead Space, and Dark Sector and the like.
If you want to see an example of the process check this video out.
Older one but wanted to show because I liked it a lot:
Older one and very fast; an example of how abstract it still can remain but convey some atmosphere and depth:
This one is from recently. It went into the “jungle at night” direction:
For more Chaos to Control Works click here.