The expression is on point. I would recommend refining the sketch even further, to focus more on line weight and avoiding scratchy lines by replacing them with confident, sweeping lines that doesn't break the contour of the shape. I don't know the sort of hardware you're working, as I can't seem to tell if you had any pen pressure, because you're definitely going to need that for improving your draftsmanship. The more you spend time drawing digitally, you'll become a lot more confident with it.
