I told myself I was going to ignore this thread, but I have to say something. No, you can not type someone by simply looking at a photograph of them all the time. However, you absolutely can guess with reasonable accuracy what the person is like (in particular if you take the context of the rest of the picture involved with it). You can not day that you can't gather anything about a person by looking. That's what people do, we read people to guess how best to interact with them. People can attempt to gather information about someones type by videos, that has reasonable accuracy to it. I believe you can guess at someones possible personality type by looking at certain photographs in certain cases. Why else to people try doing that here? Because people have gotten it right or resonablly close to keep doing so enough of the time.
The fact of the matter is, ones personality will absolutely dictate what kind of expressions demenor and feel that they give off, and some people can interpret this. Is it perfect? Hell no, people will make mistakes. However, the reason people continue to do this is because they have had enough accuracy within themselves to show that there is use to it.
You can disagree all you want, some people find use to this with themselves. I have found use in gauging what someone is like by looking at photos, videos, and in person. It is not perfect, and I will be the first to admit I get it wrong at times. I will also admit when I can not guess at it with everyone. It gives use though, and for me to stop doing this would greatly hinder who I am as a person. Guessing at an MBTI type is just an extention of this. If you think it is a bad assumtion to do so, then that is your opinion, but some of us have found use and accuracy in doing so.
I also am not going to stand up to any sort of challenge to prove any of us wrong. I have no paients for that sort of thing (never have). You can make your own conclusions from this, I truly do not care. It works for me, it works for others, but it doesn't work for anyone else. That's all.