There's something really disturbing about the expression on that mask. I think especially coupled with Link's expression. It kind of looks as if the mask is mortified at the idea of being worn (I would imagine having someone stick their face into the closest thing you have to an anus would be quite disturbing) and Link knows it and is filled with sadistic glee at the idea.
Hooray for giant elf shoes, giant belts and wiggly elf hats! You've sure made a fun Link design there!