Photography is, for the most part, and "in the moment" art form.
I think that is one of the reasons I love it so much. I like an unplanned life ... but that's another story!
This image is an example of being in the right place, at the right time — and a fulfillment of "all the equipment all the time" rule. (That rule, by the way, states you need to carry all your equipment, all the time because you never know what you might need. And it's guaranteed, if you don't have it in your bag, well, you're probably gonna need it).
What happened moments before this image happened was this: nothing.
This image was taken on an equine photography retreat and 10 women were standing around chatting and snapping photos of flowers, trees, each other, etc. (photographers have a natural need to press their shutter buttons, it's our crack). The horses, our elusive subjects, were on the other side of that hill probably 3/4 of a mile to a mile away. Wranglers had gone to gather them.
The light was dappling the hill and it caught my eye — and then there they were, the herd! I quickly grabbed Bigma (my Sigma 50-500) switched out my trusty 28-80 and made the image you see here. I only had 3 frames ... but that was enough.
Post process in Lightroom I enhanced the colors a little bit, pulled up the luminosity to give it a painter feel and smooth the clouds a bit, and added a small enhancement in the form of a radial filter over the horses to brighten the beautiful light falling on the herd.