There's something that weirds me out about this image, but I can't figure it.

Their feet don't look like they are at 90 degrees to the leg.
Mio is not blushing.
Ritsu with a bang instead of a hair band.
Ritsu's left and Mio's right elbow look very 2D.

Plenty options for something being weird.

Nah, something to do with their navel regions. My eyes keep going there and sensing weirdness. I dunno.

Dem feet, too. Especially Mio's.