Great to see these! I feel like the forms are getting better and better.
I actually think the best one is the the third on from the left on the top row. The chin is sticking out enough and it has a lot of form. The upright tilt also looks good.
The last one on the bottom has the chin too close to the sphere and it looks a little uneven.
The ones looking down look really good! I can see a ton of improvement in those.