You definitely do not have to. I didn't in my introduction, either for exactly the same reasons. Your post will do better if you do, though. Before people around here are familiar with you as a person, some will think "maybe I won't upvote him because he could be a robot trying to fool me." The "validation" photo is your way to prove you are who you say. But you don't have to do it.
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@pulpably - thank you for the reply. I have not even done an introduceyourself post, but maybe it is time if I want to stay here, and I want to.
I notice some people do very well without even making an introductory post. They can help, though.