How big is the phone really? You would never know by just seeing the advert on the left, which would cause the buyer to question the purchase. Which by now we can agree, friction is something you want to eliminate in the buying process.
The image on the right shows the average size hand holding the phone which helps the buying understand how it would work in the hands. Get the idea?
Which one of these pictures appeals to you the most? Odds are whichever hand you use to eat is going to be the best looking one. Even though its the exact same picture, your mind thinks in patterns. You reach out with your right hand, then your brain says the right is better.