#2. I thought about it cropping the right side and focus on the ball, father eye and child eye as the triangle. This however crop the legs and may be make it a portrait
#1 hands/body with bubble extending theirs are surprisingly wonderful
#3 crops out side, but face shows less in focus... if more bubbles will be even better. (or if there is sun light on the bubbles)
#1 sigma 50 1.4 with 5dmarkII @f1.6, #3 also same lens, picture cropped
#2... too old for this. I can only last 2 min and quickly snap a few and has to call a stop to get out.