I see Junko's gift and i think that tagging here Chang'e_(Touhou} could be pretty valid because According to ZUN's words from official Touhou magazine, Chang'e right now is sealed in the form of a frog

Can we tag hecatia lapislazuli here too, because i'm pretty sure it's her hand that is patting clownpiece here.

It makes sense to think that the person out of the frame is Hecatia, but the hand alone doesn't necessarily indicate that that person is Hecatia. The general rule of thumb for tagging is that we tag what we can see, not what we know.