No, nothing sinister there, and I don't think you were any more or less approachable-looking, but I think the sly look is an improvement for you. You should seriously consider keeping the noggin shaved when the play's run is over.
Who knows why people say what they do but that woman is obviously not a facial hair fan. And I'm guessing that she's the type that, if you'd shaved a fuller head of hair, she'd think you were less approachable now.