His forehead gained a few light birthmarks and more value. You can even see some lines in this front.

If there are individual characteristics like freckles, birthmarks, wrinkles, scars (ecc.) you should definetly draw them, even if it means that you spend a few extra hours drawing.

I've finished the ear and am now going over to his hair and hat.

I almost felt a bit shadenfreude, because I didn't have to draw too much hair (it's always the same.... I hate drawing hair).