7:57 PM, Thursday September 23rd 2021
Well sometimes's google is your friend ;-)
He does have an official channel on youtube but they are mainly silent demos rather than lectures but they may help.
https://www.youtube.com/channel/UCgPj2jSpcJaN6C5xMi8ohfg/videos
Without having a real teacher who can give you feedback then knowing if you are doing it right or not is always going to be a problem. You just have to use your best judgement and don't get bogged down second guessing. Just keep trying.
Looking at your skulls I would say you are being far too deliberate in your line making here. Unlike drawabox you need to be more sketchy and loose initially. Do them with a regular pencil, or even better a col-erase blue pencil. Watch a few animators work, they always start loose with their design and then refine when they have something they like.
This is an alternative channel which I have only just discovered and it is very, very good.
https://www.youtube.com/user/PhilsDesignCorner/videos
You will see some of this type of loose sketching here.