First of all, totally disagree with the comments about weddings needing to be in colour - balderdash

Speak to most couples and they crave black and white as well as colour. Equally, there is nothing wrong at all with unposed kissing.. it looks far more natural for a start however, here we do seem to have captured it at just the wrong moment.

When I know a kiss is likely to be coming, I rattle off many frames as fast as my camera will allow.

Soft focus has it's place as long as it is not overdone. I think it works well but the overall lack of contrast renders the photo a little lack-lustre. I think perhaps a little more work in Photoshop would help this photo enormously