Wow these are getting better every time! Great expression in this one! The only thing that stands out is that the face might be a bit flat and it might round off a bit more from the middle of the face to the front of the cheeks then to the side plane of the face. It's hard to be sure though from these references. What you might do is try to observe children or babies from above and then look at your sculptures from above and make sure that the shapes are matching. Keep it up!

Nicely done! I might soften the transition from the face to the hair. Right now it looks a bit like a wig. nicely done on the expression. keep it up!

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!