First reaction: fun! Like the big sister really enjoys getting to take the little ones out. And they're clearly enjoying themselves, with the little guy on the left reaching ahead. Second reaction: I wish the mailbox weren't coming out of her head.
Innocent joy indeed. Like so many nice parts of life that we glimpse for just a second or less, there is no time to compose, frame, and make arty. One has no alternative but to enjoy the photo merely as the memory of a nice sunny moment in time.
wonderful. I love the stiffness of the girl's pose and smile even though she's running! It reminds me of print advertisements from the 50s and 60s, when everyone was so damn happy. The zigzag of the road serves to emphasize the superhuman energy of this girl. The viewer naturally assumes that she has navigated this entire zigzag with the same boundless energy.
Finally, you have one child with his hands outstretched as if to catch the wind and cause the entire assemblage to take to the air. And then you have the other child, who shares the disbelief and cynicism of the viewer.
Too tight. I like how the winding road fills the frame in the background, but the framing is way too tight here. Also, the mailbox turned out attached to the girl's head. Get rid of the heavy black frame, too.
But more than all that, the shot is pretty pointless. Sure, the girl is handsome, and the emotions are genuine, but that's not enough to interest a stranger, the shot is still a family album material.
Fantastic candid. It exudes a feeling of freedom and happiness like few images can. All three expressions are priceless and complement each other so well. As for the little kid on the left... one in a million.
I also think the sharpness and DOF are spot on. Only thing I'm not sure about is the thicker border on the bottom.