Critique my drawing skills, Southperry

What exactly is reverse technique? And wow. Thank. You. I don't know why I didn't think of using a black and white picture!

Reverse technique is a drawing that use charcoal as medium to draw on surface like paper, box board, plywood, primed canvas but you start with blackening all the drawing with charcoal, then you start to draw using eraser or white charcoal / white chalk to make lighting. And you don't need to worry about shading, you just focus on lighting and structure for recognized parts like eyes, nose, chins etc.

That's what I learnt when I studied in Fine Arts for my diploma level.