These look very good!
For me I don't really focus too much on getting the likeness. I just focus more on lighting and color which to me is more important. I like to draw the face well enough so that it doesn't look off. So from my perspective, these are amazing studies!
However if your goal is to get the likeness of the face as well ( second study), then it will become much more difficult as you may have experienced. The three main problems I can see are the ears, eyes, and mouth.
Ears: I think you got the length of his face pretty well. But his ear ( to our right ) is a lot smaller than in the reference, which consequently gives your study the appearance that his face is longer than it is.
Eyes: I have troubles with realistic looking eyes a lot cause I always seem to draw them bigger than they really are. It's even harder when they're wearing make up like in the reference here. You may be able to focus on the shape of the white parts of their eyes to get a more accurate size.
Mouth: If you look at his mouth on the reference, you'll be able to notice that more of his teeth show on his right. That most likely suggests that he is smirking there so the right side of his face will lift up more along with his mouth. Notice how in the reference his mouth is a bit tilted, but in your study it looks to be fairly straight.
Again, these are only problems when trying to capture the likeness. Anatomically I don't think there are issues with your study. I hope these pointers can help!
And as always, please take everything I say with a grain of salt. I may be correct on some things, but wrong on others.