That's a great picture, treasure it.
I have a series of my old school pictures that range from about 7yo in primary school to 16yo when I left boarding school, and you can see EXACTLY when the abuse started, my whole manner changed so much that it shows on the later pictures. I look unhappy and unwell.
The MS 'policy' on pic's is that we haven't encouraged people to place pic's on the site, apparently the bandwidth is quite small and it slows the site down noticeably if we have a lot of pic's. Maybe that's something we can improve?
We do however discourage people from posting current pictures of themselves.
That's because of the problem of security, if we have pictures of handsome young men then we're going to get perps.
I don't think we have any guidelines published anywhere, but we probably should, we've just use a bit of common sense up until now.
Go confidently in the direction of your dreams! Live the life you've imagined. As you simplify your life, the laws of the universe will be simpler.
Henry David Thoreau