Yes, when I post this on facebook, they deleted the second pic for obvious reason.
Still don't understand why certain other people can post it without any problem but I got Zucc'ed.
Rika basically drags Mami off on a date in Mami's magical girl story, while Kyouko saves Ren in Kyouko's story while being tsundere about it the entire time.
The one pair that got one image on this site is undoubtedly yuri.
This one that got two images is more like... a mutual yuri crush from what I understood? Especially from Eri's side, but... LOOK, IT'S COMPLICATED, OK?
EDIT:
To anyone who actually watched the anime:
How good of an explanation have I given, given that I myself haven't watched it?
The pair that have a single fanart piece uploaded here are basically a couple, though it's never said, they just spend all their time together and are always holding hands when it's just the two of them.
The pair in this image... Maina (the Idol) has given hints she like Eripiyo romantically, but Eripiyo has never given any hint that she romantically likes the Maina, just mega 'OMG I LOVE YOU' fangirl. There is even a scene when one of the male characters mentions he romantically likes his favourite, Eripiyo and the other guy comment with "Can't relate".
If girls are in love with each other, it's yuri, don't complicate yourself with technicalities, they being already in a relationship or not isn't a factor.
Awww, really hope someone picks up the manga for this.
Remember: the manga is by Hirao Auri. If you have read his other works, you know what to expect.
(If you haven't... well, let me just tell you that there are already 6 volumes out, and Eri and Maina haven't made any progress since chapter 1: no kisses, no dating, no talking about their feelings, nothing at all. >_< )