Dude on the left has an overall "squarer" face... Squarer jaw line, the whole side of his face forms a pretty straight line compared to the dude on the right who's head is wider at the top than it is at the jaw line. Distance from the bottom lip to the bottom of the chin also different. & those nostrils mmmm the dude on the left has nostrils that form a slight V & the tip of the nose is meatier & lower.