Attempting values on toned paper, please comment where I can improve, thanks

Attempting values on toned paper, please do feedback where I can improve

Did this portrait yesterday, I think it has a decent likeness, there's something wrong with the expression and I can't quite place it, I think the forehead is taller, how can I improve this, or should I leave it alone?

My portrait of Nicolai, please do critique I am aware that it's stiff, I tend to get caught up in the details, and don't draw with flowing lines. The quality of the photo isn't great but it's what I have.

Had some fun yesterday with dostoyevsky, and I thought I'd mess with some bargue drawing and caricature it, here's the result of aggripa, feedback welcome

Ben Shapiro rough sketch and abstraction please critique

Mark Zuckerberg rough sketch and abstraction

Some more rough sketches, Obama and Jerry Nadler , i tried to stretch Jerry's face more, didn't work out, let me know if you think it needs more exaggeration, thanks!

Focusing on sketching as suggested, redid Obama, and added Churchill and Fauchi. Please critique

Abstraction and rough sketch of Mrs. Obama, please critique, thanks