What is this Resonance~? Picture

Cerberus is BACK! (well she, was never gone, I just didn't upload any of my drawings of her xP )

Her horns are so indecisive, just pick one shape and STICK WITH IT DANGIT

Materials: mechanical pencil, printer paper
Time taken: 20 minutes or so
Cerberus is property of Me. Please do not steal her. Thank you.
Andrew Ryan-Fancy Pants
What is this Resonance~?