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Thanks for the reply! I completely forgot about this site and post. Yep, I have to get the face construction right first.

To add on what he said, here is a good video on shading:

And another for showing form:

Imgur link: https://imgur.com/a/2RFoD0O

First of all, I am a newbie and this is my first day, this is why you see a lot of errors.
I also have lots of questions!

First question: is best to practice gesture and faces separately (one month gesture and another face) or together?
I am trying to decrease the amount of stiffness that my drawing show. With gesture I struggle with anatomy and detail (for me is easier a two-minute pose than a ten minute one.) With faces, I distort the expression one way or the other.

For faces, I don't know what I should capture with the quick sketches. I particularly struggle to draw people who smile with their mouths and teeth open.

Also, any good resources, exercises and books on said arguments are welcomed.