Daleport996 said:
Me watching an artist draw: "No, why did you erase the head? That looked alright!"

Me drawing: "You know what, I'm not feeling this angle." *Redraws everything from the start.*

Redrawing from the start is a legitimately good strategy, if you keep the original as a separate file that you can reference to see what you didn't like.
I guess it depends on your level of fundamentals exactly how much you can get out of it, but it seems like a genuinely underrated method of study.