He will likely continue to blossom over time, and especially when his new setup comes. He's going to love that.
Once acclimated, and properly handled and fed, Boa's are usually really beautiful and chill snakes.
I have a female BCI (Behira) who is a total doll, unless food is involved, or perceived to be involved! I hook train her and she's all good.
I know BCI's, and I see every day with Behira, go through light and dark phases throughout the day. Behira is an ivory ghost, so she can be very light tan to almost dark tan/brownish and her head can be light tan to almost jet black. Do Caye Caulker Dwarf Boa's do the same thing? Is this a Boa thing (potentially excluding rainbows, sand, etc and sticking with BCI and BCC and dwarf species) or only a BCI thing?
Enjoy Geddy Lee!