I don’t really like “I don’t actually look like an X, it’s just the closest thing your mind can comprehend”.
Look, if you actually saw something your senses couldn’t process it’d just be a jumble. Look at something 5 dimensional? You see the little bits of it intersecting 3D space. And you certainly aren’t going to go mad just from the visual input.
I liked the one comment on Supernatural where an angel lamented that he was really a towering seraphim with six wings and three faces, one of which was a lion, but they could only comprehend him as that lame meat sack. Or something to that effect, it’s not an exact quote.