New Idaho Cattle Piece

I started drawing for a new cattle piece. This is from a photo from the same Twin Falls, ID, vacation. I cropped the original photo to focus on the sun-lit faces and bodies vs. shadow areas.The size is 14"x20". It was cold (must have been in teens) but clear winter day. It was almost the last light. I want to paint the temperature and faint warmth of the last sun light.