kirisame marisa, flandre scarlet, remilia scarlet, izayoi sakuya, konpaku youmu, and 15 more (touhou and 3 more) drawn by amamizu_(myofuu_kai)

Awesome picture. It looks like Riviera to me: http://gc.kombo.com/images/content/boxart/rivierabox.jpg . In this picture (Touhou one), though, I assume it's supposed to be older characters vs. newer ones, it also seems like good (right side) vs. evil (left side) to me, unlike the Riviera one.