Well that's not something somebody would want to see after a long nap. I can just imagine Cthulhu running back to R'lyeh and tattling to Shub Niggurath, who becomes like a pissed off mother and flings Fluttershy into her woods for being mean to her baby. XD
This is just the finishing move. The one-hit-kill attack was this: [link] .
You did her hair great, the feathers do look fuzzy on her, and the clouds and what seems to be rocks or waves sure look nice. Her Stare-eyes look like she needs HER BRAND [link] , which is a bit funny, but not to Cthulhu. Also, Cthulhu is not only surrendering, but going "Watch out, we got a Fluttershy over here". And that expression on him is priceless.