Nicely done this is looking better! Nothing jumps out to me so just keep practicing! You're doing great.

Wow really fun and difficult facial expression with the mouth open. It's great to see how hard you're working on these portrait studies. It's hard to say without seeing the reference but from the side view the chin might be a little bit farther back (closer to the neck) so I might double check the side profile if you have a reference of that. Keep it up!