Dear Pat:
Actually the photo you posted is not a bad one to work from and does not present the Congressman in an unflattering light. It's clear he's not 35, so why draw him as such. Instead I would work on getting down the structure of his head. I realize your posted sketch was done quickly, yet even then it's important to indicate some of the darker values, like the area around and in the nostrils which make such a nice shape, the arches of his brow, the left side of his upper lip, the core shadow around his chin, the dark backward "S" shape in his ear, etc. You can see these shadows better if you squint at the photo, or even turn it upside down, and work from it that way.
The area of your concern, the neck and under chin, are also important areas to address. The light that falls like a spotlight across his face, creates a triangle on the neck area extending into the collar of his shirt. You could underplay or lose one of those folds by the collar but you have to show the value change from neck to under chin. Otherwise with no clear indication where his neck begins, he ends up looking rather turtle-like, not very appealing for ones political image in this fast-paced society.
I hope this has been some help.
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