I have no idea who most of these are. Can't see enough of them. Although I think that's Mystia's shoes on the left.

I see:
Meiling - Upper right (you can see her hat with the star on it.)
Remilia - Lower right (hat, wings, bow)
Aya - Below Remilia (hat, tie, shirt.)
Yuyuko - Center bottom (hat)
Youmu - Obvious
Cirno - Obvious

That might be Yukari in the middle, judging by her hat, or it might be one of the various fairies, or possibly a fairy maid.

Agreed on Mystia's shoes. Not sure who's shoes those are below Youmu, though.

I think that might be Sakuya under Remilia. That looks like a maid headdress and apron.

Meiling - Yeah.
Remilia - Yep.
Aya - That looks more like Sakuya to me, judging on hair color, western style shoes, the garter strap, and what looks like a maid headdress.
Yuyuko - Yes.
Youmu - Duh.
Cirno - Again, duh.
Yukari - I can see it judging by the dress's seemingly purple appearance and cleavage, coupled with the long blond hair.
Mystia - Look more like Patchy shoes to me. Mystia's have little winglets on the back and no ribbons. Dual colored ribbons are a Patchouli thing and the boots look naturally lavender judging by the shaded portions.

The shoes under Youmu are very likely Flandre's.

Right shoes, EoSD/PCB/Heorine theme.