This started out as a touch up of another artist's mural that had been slightly scratched up from excessive back pack rubbing.
It was also starting to fade and discolor.
I ended up changing the original mural a lot.
The black horse and the cow spotted horse are the least edited parts of the mural. I only added a little shading and changed their legs some.
The white horse and the brown horse were painted all by me while looking at some reference pictures.
I also changed the background of the horses from a yellow and orange desert scene to a blue sky with green grass and mountains.