Hey man,
Nice start on the head,
This dude has what they call “The Diamond of the nose” (not sure if I made that up but it’s what i call it). It’s formed by the cartilage of the nose and it looks like a diamond. Try to get it into your model.
The forehead and upper part of the cranium might be too wide from a front view.
Take a look at a skull from a profile view and compare it with your photos. Note that the back of the cranium from a side view begins to turn toward the head about under the nose if you were to extend a plumb line (or at the mastoid process). Try to find planes in the cranium so it doesn’t look too round.
It’s coming along though… just keep plugging away at it 