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Welcome to the Forum. You can be very proud of this, as your first portrait effort, and at age 16! You're painting much better than I was at twice your age.
I don't know if the color of the imprimatura was necessarily wrong. I think it can add a nice warm undertone. Most portrait artists I know who paint on a toned canvas use a cool imprimatura of something like what you'd get with a raw umber mixed with ultramarine, though.
I think the biggest issue is one you've already identified: poor source material. I can hardly wait to see what you do with some good photos.
You might want to check out the resource photo threads and take some of your own shots (properly lit, etc) for your next portrait. I'm sure it will be a knock out!
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