Ok, regarding the ears, if you feel along your cheekbone (purple) you’ll feel that your ears(green, and drawn very badly) begin just under the cheekbone, just behind the jaw(blue, at the bottom).
With the jaw itself, there are two things to mention, one is that the jawbone itself will be a little pointier than you’ve modeled his jaw, but not very visibly, because of the flesh that covers it, so, just blunt off the corners a little.
Two is much easier to see in a mirror. If you look at yourself straight on, you’ll see that where the area of the chin ends, there’s a bit of a dip, before the jaw widens again and softens out a little. This is more or less pronounced on different people BUT it’s always there. It’s because that’s where all the muscles around the mouth end, and the muscles of the jaw officially begin. I exaggerated it a little, but you should be able to get a very good idea from looking at yourself in a mirror.
The brow is pretty well shaped, but if his brow is slightly furrowed like it appears to be, then you’ll need to curve out the model (cyan) where the fat and flesh piles up, pulled by the muscles. Again, it’s always helpful to check yourself in a mirror or — even better — the face of someone you can convince to sit around and let you stare at them.
The line from his nose to the corner of his mouth ends the right distance from the mouth, but it’s usually curved inward slightly (orange) because all the fat on the cheek pushes against the fold — spilling over, as it were — and yellow are just various creases that make themselves visible when you’re smiling. Although be warned the whole cheek area will be drastically different if you decide to model him in an all-out happy grin, though what you have now will work fine for a solemn, kingly smile.
Anyway, looking good. Hope this helps and keep up the good work.