Blue is a 'solid' color in rabbits, i.e. not an agouti based color. When you have agouti + blue, then it becomes 'Opal'. At least, in English angoras, not all rabbit breeds have the same color names. It's a pretty color.
The dark brown one with a white belly and white eye circles would be a chocolate agouti. At least, if it's an English angora. Not sure if the color name would change if it's a different breed.
The pink will be most likely a Ruby Eyed White. If you have the Vienna gene in your herd, it could be a Blue Eyed White, although most likely it is REW. Although, I think REW is dominant over BEW so it could be both? Genetically speaking, of course. On the outside, a white rabbit is a white rabbit. In any case, if it's pink at birth, it will be white as an adult.
The REW is just a 'whitewash' over what ever color the rabbit would be if it weren't albino. Which is something to keep track of if you're breeding for specific colors later.
Since the babies are the offspring of a solid color of rabbit, the blue buck, and an agouti, the chestnut doe, all the offspring will have a recessive for solid colors even though they all appear agouti. Well, except for the pink one, that one could possibly be a solid color although at this point it can't be determined. More than likely the doe doesn't have a recessive for solid colors or you'd have seen a few more non-agouti in there, but it's not certain since the statistical sample size is so small.
