The head looks okay.
I didn't like the Alastor model, but overall, the demons turned out well.
I'm also experiencing some lag – there were no problems with the elves, but it appeared with the demons.

The same issue with lag. It's also happening with the demons, but it doesn't seem too critical.
Is Alastor the first one in the list? If he agrees with you, "I made him out of whatever I had")) and he's also wearing a mask, but he turned out better. Yes, I collected many heroes by literally piecing them together ((( this is about the foot soldiers of Inferno. I probably only found two ready-made heads. The rest were assembled from 5-6 parts. Take a look at the texture file, and you'll see for yourself.

Added 3 minutes later
Regarding Alastor, you could try drawing those eyes.

Added 2 minutes later
What do you think of this Lord?