Nikki Sixx

Yeah, his expression rules... Something like "grrrr, I'll photograph you to death!"
Otherwise you really need to buy an eraser in pencil and start working with it. Even dark clothes like these have folds, lighter places, darkest places, blah, blah. So does hair - it would have helped a lot to highlight several hair strands.
Keep drawing. You obviously have some talent you can build on.