This person, who is made up with a geisha air due to the whiteness of her skin, has a circumspect air, somewhat worried or even embarrassed... but with a smile that can be sensed.
He confesses that his hair isn't curly, it's probably straight as a board. the irony of the changes of look, of appearance, and the possible denial of those changes, although in cases like this he ends up confessing. The irony and sarcasm of treating such a trivial matter as if it were something crucial.