Thanks for your sweet comment, but I'm not brave enough to start a sketchbook here. I'm working on it.
I really enjoy how you handle your lines. You use some confident dark strokes, some sketchy lines with lots of movement. Your anatomy is getting really good, too. You improve fast, haha. I'd say that you should work on faces a bit more. The proportions are a bit off.
Also, all those beautiful pages of hand studies, and you wimp out when it actually comes time to draw hands on that last two images! You draw hands very well, so don't be lazy!!
'Cuz life is full of your regrets, and I should be one...