What makes a girl's face pretty or plain?

Anonymous
I'm just curious to know what do guys consider a plain face on a girl? I've always thought I had a plain face. I just think that my blue eyes are my only pretty feature. But I've also had plenty of guys say I have a pretty face. But does it even mean much when a guy says a girl has a pretty face? And I know guys have different opinions, but I just want to know anyway. So what specific features make a girl's face plain, and what features make a face pretty?
What makes a girl's face pretty or plain?
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