Visiting and painting a scene at different times of the day is a very good idea. I have my favorite scenes that I just keep painting over and over. This scene in Yosemite valley is definitely one of them. I keep learning about how light changes color appearance and value patterns.
For instance, in a back lit scene like the horses in the morning there is less color range compared to the afternoon scene. Or is there? Yes, in the morning the colors are predominantly cooler in temperature, the warm colors are there too but they are less warm than later in the day. That is the major difference in the two scenes. The morning is more atmospheric, however, both scenes have the full range of value from lightest to darkest.
In fact, one might argue that the value range is even more drastic in the front lit scene. Notice the darks under the roof of the barn building.
Both paintings do have warm vs. cool colors. The dark shadow in the afternoon scene is cool in temperature overall, but upon closer examination you’ll find warm accents within it.
In terms of painting, the interplay between warms and cools make a painting work. In fact it might be one of the most crucial things to learn to do right besides control of value.