Doesn't genetics have to play some part in this?
I won't argue vegan vs omni, but seriously.. when it comes to exactly how long someone will live, how healthy they appear/actually are, how nice their skin is, etc etc.. certainly some of that can be attributed to their various eating habits. But a large amount of that has to do with genetics. So, in my humble opinion, in order for a comparison like this one to work, you can't just use a random vegan and a random omni (referring to the first couple of pictures) but you need to use to people who are genetically similar (no birth defects, predisposition to certain conditions, etc) and those two individuals would need to have been on a strict vegan or strict omni diet for X amount of time and then you can make the comparison. Otherwise, -shrug- the results are likely to be biased anyway.
For example, I think I have relatively smooth/clear skin. Now, if someone used an image of my face vs an image of someone else's with acne and said "blah blah, this person doesn't eat meat, see her skin? And this person does eat meat, see her skin?" that just wouldn't be a fair comparison. I've always had relatively clear skin, my mom does and her mom does, etc. It has changed for the better (regarding being less oily) a bit since I changed how I eat, but I've simply always had fairly nice skin. It wouldn't be fair to compare me to someone who struggles with acne. That's the point I was trying to make above, idk if it's clear or not. I'm kinda tired still. D: