Photo of desired pose for the painting:
Beautiful brownish/gray horse, right?
Here's a photo whose colors are not blown out:
But I was happy with the final outcome and hope the owner is pleased. (I added his gorgeous white tail that was in yet another photo).
4/3/18 Update: The owner wrote to me after receiving the painting and it makes me so happy:
I am shedding tears of "thanks and joy" to you. And I know Sherman approves as well. He was so very special and we knew each other so well. You got his "eye" right -- it shows his intelligence and kindness.