Hi, I think your work is nice, some faces and expressions are not good but some others are really well done like the 7th, the 8th and the last one. You should try to work with shapes to improve (shapes created by lines of the face and its volume). D'ont hesitate do draw the shadows (and light).
before drawing lines, when you are starting to draw the face, make an oval of the shape of the head and place some important elements like the nose and eyes but just with a few strokes lines.
You can also practic by drawing the same figure many times, until you're bored, but you'll see that you'll really improve (it worked for me !).
good bye, I hope this was helpful !
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