I'm not even a fan of Socko but I think she's great in this. The crayzay makeup is just a prop; the message is that they're having fun with wacky clothes, hair, silly-cam, etc. They're being
Manic Pixie Dream Girls, Pamyupamyu-esque like UreChissa said.
Also Chinami is just out of her mind.
Anyway, another awesome BK PV.
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EDIT: I keep watching this PV. It's awesomeness CANNOT BE GAINSAID. Even with the volume off it's fascinating.
Risako seems to be performing in a slightly different video than the rest of them. BK is an idol group - they're supposed to use the exaggerated facial expressions of the idol, everything's a bright shiny facade. We know it's fake, but we love them in spite of, or maybe because of, their blatant artifice.
Half the time though, Risako seems to be giving us a genuine glimpse into her soul. The way she looks at the camera isn't, "HI, I'M YOUR DREAM GIRL," but "hey, this is me." Almost like a performer in a non-idol PV. This scares me a bit, because I remember Kago starting to do the same thing, shortly before her scandal broke. When they lose interest in the facade, the results can be entirely unpredictable - maybe exhilarating, maybe tragic.