Dog Body Language: Photo example

I was taking pictures of Elka in her harness, when I got this picture. I'd asked her to sit, and she got up in between completing the cue and my getting the picture, so I asked for another sit.

See the lovely calming signals Elka is presenting? She turned her head, so she isn't looking right at me. Her tongue is doing that because I caught her at the beginning of a yawn. And she licked her chops after. 

Sorry, puppy, but "sit" does mean "sit".