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Magnificently excellent work on your faces and expressions, SINE, yet, I've got one small offer: Would you like to draw up yet another 5 minute sketch of a facial face, pretty, pretty please, please?? The vindication is because, your airs will become even more moving and vital. Hope and expect that it'll resolve.

Polyvios Animations

These are really cool expressions, and I think they would benefit a lot more with the eyes and eyebrows placed in. Eyes can convey about 70% of emotion as compared to the mouth, and that's because there's sooooo much creative things you can do with eyes. If you want to reduce stiffness, this will definitely be a good place to advance next.

If you need any tutorials or tips, I know a good youtube video which supports this :)

hope this helps