Irwin looks a little flat, W/A does this, there not good for portraits. Don't put fat people on the extreme ends of large groups it doesn't flatter them I did it it with a brides ( obese) mother once to spite her .paid for it though!!!!
Maybe it's just me, but there appears to be a perspective issue here. Perhaps you used a 14mm lens or there about on an angle. It's a fine image otherwise. Wish I could have been there for the burgers. Yummm.