This is my first critique, so sorry if you don't like it! I personally really love this drawing, very inspiring. But I'd love to give you some tips, if you need to draw a long line do it in one smooth movement. I personally think it's super hard. Also you should try to make the shadows more smooth, but you are already doing a great job with that. I also noticed the pinky, the whole thing is a bit too long. Look at your own hand and compare it. I can say that you are better with hands than I am, but hey.. I hope this helps you a bit.