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These are pretty good beginner studies although the chin on the first head,(going left from right) looks a little too large. You should look into studying the skull the human skull more and just the general proportions on parts of the head.

Hello there, SINE,

I just wanna say, magnificent work on your head and expression gestures. That's very awesome! Again, if I was to suggest a comment, then I would say that I really don't see enough of the lighter, connecting lines here. Why don't you please loosen yourself up, and connect your edges more, by going for 114 more minutes of 27 second faces and expressions? (114 x 60/27, 6840/27=roughly 253 poses, or expressions) (all flipped, please??)

The reason why you could do this drawing challenge is because, it can and will help out on making your facial gestures more, more, and more vital, energetic, and light, and the least rigid. Good luck for you, and I hope you've found this completely and totally instructional.