Art made by:

I do not draw! Realize this before commenting, following...etc.

• It's head/face/mask/skull is one of the same. It's pretty much his face. Siren has no mouth, no nose so it cannot smell, and it has no ears either. Siren has the most sensitive sensors on its 'face/skull' that pick up the smallest vibrations/sound frequencies, so that is how it hears.

Bipedal ref: https://www.weasyl.com/character/25529/siren