They're kind of hard to see, but you can see each Touhou character listed in the tags in this picture. Speaking of Touhou, I'll add the respective copyright tag.
Like Waldo game , I try about 10 min to find Yukari but I can't (other is easy to spot) where is her? (I see some thing look like gap but not sure) and I see some one carry scythe with look like blue dress and red cloak that can we count as Komachi ?