That bottom and top one look especially nice! I've been trying to find if there is any way to tell from a hatchling how much color they will hold or it all bananas sort of washout as adults, but as you've said it's difficult to find pictures of adults much less before and after shots. I have also poked around trying to see if certain morphs helped bananas keep color, but again not much luck.
On that note, I've been wondering, at what age does a ball python's color stop changing? Or does it change its entire life? o: