I say throw away shot #1 and throw away shot #3, because shot #2 is,and I seldom say this--TOTALLY AWESOME.
Shot #2 shows the cutest little elephant, in a dynamic, crouching pose. The elephant "toenails" look good. His expression is clear, sharp, and his line of gaze is super. His mouth is open,and you can see those cute, perfect little top two center baby teeth are in. He looks active in that pose, both in body posture, and the way his hands are positioned. In shot one his tongue is laying there and making him look babyish,and he's seated flat on his keister, while in photo #3 he's looking out of the frame, and the composition is loose and disjointed and his off-to-the-side gaze ruins it.
Shot #2 is a professional-grade toddler theme photo. Great dynamic pose, great facial expression, animated hand position, sharp,clear face, costume looks good, the entire compositional space is filled and it is framed properly as a horizontal. This is just a SUPER-DUPER, AWESOME halloween studio shot on a kid that age. I hope your parents and your wife's parents are all still alive, 'cause this is a grandparent's dream shot.:thumbup: