Simply amazing pics. I can't get over the coloring. "Classic" is right. I agree, you will likely not see any major changes in Kevin's overall look, however, seasonal temp changes or sunbasking over the summer will likely allow you to capture variances in his coloring that we will all love to see.
I also like the larger enclosure you're using. Definitely a great way to watch him and from my experience he'll certainly like to explore. I opted to stay with belly heat as I believe that helped get Alpha up and out as he seems to like much cooler temps than the ball pythons, except when he's digesting. I also have not used UV either.