The first is meant to be powerful. It looks like a soon to be King and Queen because of the more rigid postures of their bodies. This photograph is to win over the more conservative citizens. The second photograph is a warmer embrace. They both wear light colors and it looks more like a typical engagement photo you would receive from your friends and family. They appear approachable and warm because of the genuine happiness exuding from their smiles. This photograph helps win over the more liberal audience. It takes away the role of King and Queen and just focuses on the love of a couple.
