Here is a blow-by-blow of process shots for the Crimson Blades cover which I did for Beyond Belief Games.
We wanted to invoke a classic pulp feel. Strong blacks, red and white were on the mood board.
I chose to overlay a painted texture on the blacks to give it more of a 60s/70s feel. To suggest the magic and mystery in the game. It also served to unify the design by bringing it together more. The original blacks popped a little too much.
All work done in Sketchbook on Galaxy Note.
The process is hopefully fairly clear from the shots, but if anyone has any questions, let me know.