This is a great idea.
One thing is that maybe it would work better which clear eye contact.
I couldn’t say for sure without seeing one with more eye contact as the shaded eyes and smile coming though is very charming, the smile carries it.
In any case it works very well, and the motion effect adds a lot of life to the shot.
Taken at a playground in loughrea some time back, i liked the criss cross pattern of this cradle? type swing that you could push back and forth, the more the pushing the more the laughing. I was aiming to shoot from underneath using fill flash to illuminate the face more. Was pretty happy with mischievous smile even if the eyes were playing hide and seek a bit too much .