It looks to me like he has one button buttoned, the ‘always’ button, yet the tux seems somehow ill-fitting. His smile doesn’t match hers in radiance, hopefully just a ‘guy’ thing.
She looks so polished, and he, as someone else pointed out, looks like he shaved early or not at all since yesterday. His button’s open in the photo. He just doesn’t look “fresh.” But I don’t know, so long as she’s happy...