Nice! Is that paint or different shades of stain on the leather?
It is not paint or acrylics it is dyes. They soak into the leather so they do not crack over time. Like anything, pending what you expose them too, the weather can make the dyes fade. But for the most part, if you take care of your leather they hold up pretty good. Just had a customer re-order and sling I made for him 10 years ago and it still looked pretty good other than it looked like he had the face of it rubbing against something for a while. Leather looked like an old pair of scuffed cowboy boots the carving was still in tact.