Originally sketched in pencil, and then outlined in Adobe Illustrator, before coming back into Photoshop for coloring, lens flares, and background effects. That’s an extra step from my usual flow, but I thought, well if he’s gonna be a robot, he should have 100% straight lines.
I ended up doing a BUNCH of variations of this one, because, y’know, there’s a billionty recolors of Starscream, including this Transformers: Generation 2 version: