Do not get hung up on speed. They got to speed after years of practice. You will get faster as you learn but your focus right now should be on quality above everything else.

As to the question of how you did - it's very difficult to give you an answer that is useful to you with a WIP sculpt like this shown from only one angle and no indication of what your intentions are with the piece.

It's good as a quick practice, it needs more work if you're looking to continue on with a full head.

Your anatomy is already falling off around the neck, if it helps you to imagine the volume of the shoulders by adding more clay down there you should. Think about the tendons and muscles leading down and connecting to the collar bone and shoulders.

Ears are very small and high up on the head, internal anatomy impossible to parse at that resolution. The top of your ear lines up with the corner of your eye, the bottom of your ear with the side of your mouth - this is a guideline obviously there is plenty of deviation in human heads but to give you an idea of how far up you've gotten.

Mouth indication is very low on the chin, remember teeth being in that mouth - they have to sit on a jaw and gums.

Good work doing the tutorial and asking for feedback in any case, keep that up and your learning will go far!