I've created a package of presets called "Darkest Brushes".
A few oil brushes which try to capture the essense of the art style used in the video game The Darkest Dungeon with artwork created by the excellent artist Chris Bourassa (cribs - http://cribs.deviantart.com)
Darkest Dungeon is an amazing video game, and one of my favorites.
You can download the ArPack file here.
I was able to create as an example (WIP of course) something that looks similar to the art style like this (reference here):
If you're interested you can check out a script of the process used to create the presets here. (shown as final output in image above).