Modeling on the face looks pretty good. I’m not really sure what the problem your having with the mouth is. It’s a bit small, but you’re not going for realism. Seems a perfectly good stylized mouth to me.
The side view, on the other hand, shows some deficiencies.
try to get a loop (red) running along the forhead down in front of the ear and following the jaw. That should help with the chin and the neck modeling. The back of the skull (yellow) has edges radiating from the ear. The neck (blue) is a bit more complex: the throat runs backwards from the mouth, two muscles run from the skull just behind the ear to the notch between the clavicles, and the back of the neck is defined by the muscles attached to the skull. My recommendation for the skull and neck is to get a side view background reference photo or drawing.
Mr. Bomb has an excellent video tutorial on making ears, which I’m sure you noticed were missing.
For a few hours work, you’ve got a nice head going. If you haven’t made an ear before, it will probably take just as long, the first time. It gets quicker with practice.
Perspective does what it does. In camera view, you can play around with the distance to the camera and the lens size to get different looks.