>>4413774Hime is "princess-style," usually more elegant and exaggerated hair, accessories and of course a tiara or crown, while sweet has more child-like accessories such as candy, cute animals, rainbows, etc. There is a lot of overlap though--the main difference is in the accessorizing.
Pinku and mizuro used to be bigger iirc, as did shiro and kuro. Single-color outfits are a bit old school nowadays I believe; they're a bit dated. (I'm a classic lolita so I might be wrong about that.)