Teacup Ride(edit 2)

[Kynaston Levitt]

Poking around I found —personally, I think having an internal rhyme for the opening line* sounds a bit amateurish (if it isn't a rhyming poem). 
a photo from Disneyland.
The background an electric rainbow blur, —having read the whole poem, I'll say this, there's a lot of punctuation going on, but it isn't always clear it's being used effectively or correctly... same goes for the enjambments.
their horizontal hair, bodies —I don't like the vagueness of the "their". Is the "mother and daughter" reveal so important that the pronoun game is necessary? 
curved in motion.  Only serendipity —"bodies curved in motion", maybe consider revising this description. 
of light, shutter speed and aperture
could capture, so bright, the eyes 
and the smiles; the almost echo
of laughter within —"the almost echo of laughter"... I haven't read the previous versions, but you have edited this a few times and I find it astonishing you landed on this phrasing. Why not just "the echo of laughter / the spin and the twirl / of a mother and daughter."?
the spin and twirl
of a mother and daughter.

This whole thing needs an entire rewrite. The core idea is great. Inspired, even. But the execution needs some serious tightening up. If you could cut off all the fat, sort the punctuation out, and concentrate on a more linear progression, then you could have a really lean and cool poem.