Hello! I checked out the post you made, and I have some thoughts for you. I love love love how you've been able to sketch the face shape and features within the 30 second times. One thing I personally struggle with is the size of every piece of the face, compared to the face shape itself. You seem to have gotten pretty good at it in your practice pieces, and I can see you learn more with each one. Your one minute sketches are really nicely done, with great features. You clearly have the ability to capture the emotion of the face, which is wonderful.
I think, for improvements, I can really only think of two things. I'd suggest focusing on the eyes for a few sketches. You've got placement and size down, but the pupils and irises, as well as where they are looking, is something that we tend to capture better in the longer sketches versus the shorter ones- which means less practice in general. Not that you're doing them wrong necessarily, just that you may want to add on the practice. The other thing is shading. Your shading is really well placed, but it does not vary. Consider focusing on different shades within the face, especially in your longer session faces.
Other than that, I think you're doing great! Keep up the good work, and keep doing the 10 minute sketches, the one you posted in this gallery is wonderful!
-Abel :)
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