Good looking group of snakes. I would pair Brianna up with Bryan when she gets of size to see if there is anything genetic working there, she looks a LOT like dad. Ace is a LOOKER, As suggested above, I would pair him with a pastel, cinny, or black pastel. He has a great pattern, and it may just be genetic. Kay has an interesting head stamp and may just be hiding something genetically, the fun part about ball python breeding is you never know, maybe even take Ace back to Mom, if you don't have the $ for a new female, or while you are waiting for a juvi to put on size.

Great looking snakes!

Good luck!