Okay, I'm gonna try something here.
What I saw was the appaloosas being the storm. The sound of their charge is the thunder; the quickness of their feet, the lightning; and the blurring of their colors, the grayish texture of the sky.
An image of something so beautiful, gradually becoming a force of destruction...
and then the past tense:
I have loved you.
Just so you know, I read this about ten times and stood dumbly at the screen trying to come up with a worthy analysis.
A very...abstract image. I find a lot of beauty in this piece.