Hi Kerioak! That's a handsome portrait and I think your flower experiment yielded great results! I did take a few minutes and scratched out some lines to suggest what I was talking about on the driftwood log the horse is jumping over.
As you might see, the seaward end of the log is challenging that wave coming in, raising a bit of spray in the process. It provides a logical point of origin for the sea-spray that is already in the air in the painting as well as being just the kind of obstacle a horse might need to leap when they've chosen to frolic on the beach.
As always there is no right or wrong with this stuff. There is observation, and there are choices, infinite choices! Yaaaaaay!
One account,
many possibilities