Don't listen to what anyone else says. Especially people on the internet who will be unnecessarily cruel just because they can. If someone is saying mean things to you, just block and ignore them. They aren't worth your time or thoughts. You don't need the approval of others to make you beautiful or pretty. Likewise, someone saying that you're ugly doesn't make it so. The only person who can decide if you're ugly or beautiful is yourself. There are much more important things than worrying about how you look and what others think of you.

Honestly, people are idiots who haven't two brain cells to rub together in order to figure out that words have incredible power. A person can be made or broken by the words spoken to them. For some it might simply be you have light colored hair and they prefer dark, or maybe they prefer less eyeliner, or more eyeliner. Some of them are ignorant enough to just automatically assume that if someone is posting more than one picture of themselves in one place they must be "attention whores" so these individuals take it upon themselves to throw petty, meaningless insults around to make themselves feel better for not being secure enough in themselves to post even a single photo. shrugs it all boils down to all too many people are douchebags. Take criticism not consideration only if the source is someone who has demonstrated they genuinely care about you. And really nobody who cares about you is going to lie to you by calling you ugly just for the hell of it. As the saying goes, "haters gonna hate." You can let them hate, but you don't have to be chained down by it.