Truly quite interesting to see what changed,and in this case,some pretty poor choices really,more so with Miku and Yotsuba,it's easier to pretend to be another with hair bands then headphones and that just a tad bit longer length is pretty good.
But the biggest change being Raiha,she looks taller(possibly older then what we see later),and a normal ponytail(not that her amazing hair was a bad thing),makes me wonder if her being a more mature and involved character was the intended effect.
Regardless,this is definitely fun to look at,almost as much as the Onii-chan from Yuru Yuri,and this was clearly one of those made to be a pitch for the full serialization.
The rest is history.