/ic/ - Artwork/Critique

Want to design myself a few t shirts. Tell me, is there a way to tweak a photo to get this kind of graffiti-look effect? I could be wrong but it looks like the game makers just took a screencap of Travis's in-game model and shopped it to make it look like a painting for the promo material. I really like this look and wanted to experiment with the style myself. Any advice? Thank you