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This is addressing all of you at the same time so I won't bother tagging. The BIGGEST problem with putting a description to something that previously did not is the destruction of immersion. Now that may sound obvious to you, but not quite what you may be thinking. You're worried the reader won't be able to self-insert anymore. That's not a problem, most people here don't actually self-insert. The major problem here is that you'll be breaking the image they've already constructed in their head by doing it. That's a big deal breaker. I think, in my honest opinion, that if you haven't already described your character at the start, and you've already established him through writing, putting in some info that can break that mental image each reader has made in their minds, that's just a bad choice. Maybe what makes it so fun for that story is the way they imagine X, and you'll be telling them it's actually Y, that may suck some fun out of it. I wouldn't do it if I were you.
