From a fashion point of view:
Seira: choi busu, all the variations of purple/red sorta clash, blouse is a bit lumberjack
Akane: choi mote, nice color combi, some frills to accentuate her femininity, tasteful hat... not 100% sure about the pants.
Rina: busu, she looks like a ghost. No color at all and the dead ferret on her head isn't helping either.
My personal point of view:
Rina
Those shoes look awesome, the socks are cute, and the dress is subtle
She's been growing on me a lot lately.