Hi, I'd like to create a an encounter/battle map (1" = 5') featuring a ruined keep on hilly terrain. See below for the kind of map I'd like to model this after. I'm new to mapmaking in Photoshop - could anyone offer suggestions or point to a tutorial on how to create a hilly and rocky terrain effect?

Thank you!

watchfire_keep_by_torstan-d46mfo7.jpg