Hi John,
The first photo shows the girl on the right (are these sisters? must be!) to be having a very convincing smile. It shows she is enjoying the shoot very much. The girl, young lady, on the left seems a bit hessistant, am I doing this right, maybe? With the little dog in the shot the hole picture must certainly bring a smile to their parents face!
In the second photo I love the look of the dog on the right hand side, as it seems to be investigating what you're doing back there.
In the third picture the sharp blues on white and the cat draw a lot of attention, almost stealing the attention from the lady. Maybe you can consider reducing the dual flash reflections in her eyes to help a more natural look.
Thanks for sharing.
Martin