The whole "beauty is in the eye of the beholder" thing is too simplistic when applied to humans. The issue is actually fairly complex with different underlying factors. Firstly it's not just facial features that affect your beauty but also a certain "vibe" (for lack of a better term) those features give out, not considering behavioral factors. That's why sometimes we can find someone looks ok in a photo but not when interacting with them (again, not considering their behavior).
Secondly, adults these days tend to be too PC about commenting on others looks to their face, so there is no way you can get honest feedback about your appearance from them. That's why in my opinion the best arbiter of someone's attractiveness tend to be babies and young kids, and the way they react to you. Kids are too immature to be PC and will just reflect the first thought in their mind when they see something. If they recoil in horror and try to move away from you after just one look at your face (as plenty of kids have done to me), then you're objectively, genuinely hideous and there's no hope lol. If this is the case, any adult who says you're good looking is just plain lying to your face. If, OTOH, they smile at you and/or want you to pick them up etc, then you're probably ok. That's imo the bare minimum standard.