Hey there, firs time seeing your journey thread. Just wanted to let you know the progress you've shown so far is pretty amazing.
You can see more confidence in your lines, better view of perspective in this last face you made, better shapes, better shadowing. Overall, you are making really good progress.
On this last face exercice, I feel like I'm pointing something you probably already noticed, but it feels like the structure used has more of a male shape.
The chin is wider, checkbones feel a little wider, as well as the nose and the ear. Refining these features should help get closer to the reference.
I'm really bad at explaining with words, so this example hopefully explains better what I'm trying to say.
That said, I'm going through this exact topic myself right now, so I'm also still learning. It's interesting and fun to see how others are tackling these exercices.
Keep it up man, as I said, your progress really shows.