I’m working on an oil portrait of Don Vito Corleone (Marlon Brando) from The Godfather. It’s still in the blocking-in stage, with a burnt sienna underpainting on 8"x10" sketchbook paper primed with acrylic gesso. My question is—how do you keep from slipping into too much detail at this stage? I find myself wanting to refine early, but I know blocking is supposed to stay broad. My goal for this one is to make it monochromatic so I can also use it for a value study.