My second attempt, scrubbed the first one because I got a phone call mid way through. This is recorded using OBS (free) and played back in real time.
Process: Drag in a figure, pose it to look more menacing, scribble some color on a separate layer, use the auto color feature, duplicate the autocolored layer (they are multiply layers), darken and reduce saturation on the top layer, air brush transparency to remove some sections of the top darker layer to create light areas on the darkness, merge the layers then just airbrush in some details to make him more menacing.
Done. 6 minutes and some change.