Some of them I make myself, some are brushes, others are culled from google image searches, in this one, the skull is a brush, the tribals are fairly common flash from tattoos, the flames are brushes, the mechanical parts are just doodles but I've been experimenting with making some brushes of my own now so who knows? I've got an idea for another piece I want to try tonight, it'll be totally in the other direction from this style, something minimalist but still a little gothic.