Oooh it IS similar to the Sheikah symbol!
I don't remember exactly what I was thinking for crying eye, but if I had to guess... I probably got the idea from Hisoka (HunterxHunter). I remember looking up a bunch of eye symbol designs - mostly Illuminati and various Greek evil eyes - and I mixed and matched from there.
Most of his design was inspired from Esmeralda's skirt from the Hunchback of Notre Dame though. :D
edit: And also YuGiOh... Hisoka, Esmeralda's skirt and YuGiOh.