I finished watching Gundam: Iron Blooded Orphans for the second time a couple months ago, one of the best anime I ever saw. Been wanting to practice muscles for a while too, and drawing Mikazuki felt like the right way to go for that. Got a bit carried away with the background too, discovered a very useful brush setting while working on it. Makes for great grainy/rocky texture, the downside is that it really bloats the file size.