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 ?

Yukari is not there. On pixiv, there are only 4 characters tagged.
And canonically, she shouldn't be there anyway.

Other than that, I see some sort of grim reaper on the left, and someshing with either a really long neck or a lantern fish-like appendage.

Added notes showing the characters and their locations (I might've gotten Parsee wrong? But considering how she's suppose to be near/on a bridge...)

EDIT:Nvm, forgot to look at the other half of the picture lol.