Okay, I guess if you really focus on that frill below the bowtie, you can sort of see a "The Scream"/Giygas/Uboa face. I think this is probably a case of reading too much into generic blood spatters.
IMO, the when_you_see_it tag should always be accompanied by a tag relevant to what's hidden. Half these threads are full of "What? Where is it?"
If you zoom out and look at her official art, her shirt is a giant screaming bunny face. This is especially true when she's in her Yandere mode color scheme.
