Lacks any indication of eyes.

Yes there are frame helms that don't have facial indications, even look very face mask looking, like this, but honestly I feel this is frame has a stronger impact when eyes are present.

This one makes me think of the Harlequin Helm the most, and I would bet that was the inspiration, but that seperates it the most is the removal of the eyes.
I understand if someone says that this mask resembles more of a face mask, that covers it, to place Mirage in a state of "mystery", but that isn't what Mirage is, Mirage is the flashy acrobat, who dazzles her enemies with her exterior, prior to the sinister deadly blow that is concealed by this.

Piercing eyes are needed to emphasize this, it tells where her focus is, the next who she shall dazzle before that blinding end.

If I could say how this would be done? Face masks have very slender openings, and the eyes hide behind them, so a shine of energy through would supplement that.

[Edit] I'll clarify, that I do love the bells, and the outward lick of the very jester like hat, something that hasn't been done yet, and it is done well. I'm just drawn to the eyes.