[OC] A belated 20th Imperishable Anniversary

Just had this one backlogged for a week now, but with some more tweaks and silhouette and text fix-ups, it's now as fully complete as the full, bright moon tonight.

Characters: Reimu Hakurei, Yukari Yakumo, Marisa Kirisame, Alice Margatroid (with Shanghai), Youmu Konpaku, Yuyuko Sagyouji, Sakuya Izayoi, Remilia Scarlet