Help Choosing a Picture.

This year for Christmas I gave almost everyone I know a portrait of their dog. I'm taking care of someone's house while they are away and I took care of their border collie Sam overnight because they accidentally messed up the date he was supposed to go to the kennel. They way over paid me for doing this and they also gave me a Christmas present to boot. So to thank them for their kindness I want to do a portrait of Sam for them. Only I'm having trouble picking the picture. Any help is appreciated.