What I meant is that it was your opinion that it wasn't a cool monster.
The same could be said of literally every single great monster design - Giger's alien can't turn it's head because he has huge shoulders and clavicle and a humongous phalic head. It has freaking exhaust pipes coming out of it's back. It's tongue is another mini-mouth that serves no evolutionaty purpose, etc etc. The genious of all this work is that every single design decision is meant to have a deeper grounding on other stuff, semiotic and shit.
All of those line syou wrote are great valid points, but you're overthinking realism, when it's pretty clear that monsters are an allegory - a metaphor for different kinds of phobias.
Based on what OP said his briefing was, I think it's pretty clever to make an angel without Eyes, clinging to the "blind faith" metaphor. The decaying, stylized body a symbol of old, archaic and distorted sense of oneself, just like the catholic church. The wings where the ears would be are hinting that it doesn't listen to the context it is in, it just believes it is better than everyone else, a "holier than thou" kind of attitude.
Certainly doesnt use those wings for flying, since their size and location and all.
You're just thinking too much "mechanically" and "real worldly" - when you should be thinking more of allegories to illustrate and incarnate deep fears and uncanny feelings.
Personally, I think that's a pretty cool creature. I think he should elaborate more, but it's on the right direction, design wise.