If you like to check out humble first attempts, A Barrack Heist is a nice 5 minutes wonder. Nothing is overcomplicated, the scope is bit-sized, the difficulty is pretty low, even on expert, and the geometry is quite simple. I'd say the lighting is the best part of the overall map, but I liked the little courtyard as well. Lots of rooms for improvement, but it's a respectable start. Keep it up!