Untitled

You did a fine job, SINE, on your faces and expressions, yet, I've got one littler request: Why don't you free up ambidextrously (either hand) in your next 5 minute sketch of head, pretty, pretty, pretty, pretty, pretty please, please, please, please, please????? The impulse why is because, your head shapes will have more and most comedy, the most cartoony feeling and all exaggeration. If you wanna look up head shapes, be sure to look up Ed Emberly's Book of Faces. This is just my bit of personal advice, and I know that's very unconventional is because, though it's aimed at young artists, although, it's very useful on how it could be applicable to quick sketching exercises. Trust in the both of us that it'll help and support and aid you out.

Polyvios Animations

I really like this. Especially the bottom right expression.

I can tell the direction of each face, and while I think you could work on your overall proportions (and who couldn't :P) you've done a great job.

Keep up the hard work!