I want you to know I read your entire comment in cookie monster voice in my head.

Different eye colors obviously doesn't mean they can't be related, but it wouldn't make sense for Maz Kanata to say "you have the same eyes as your father" if her father's eyes are blue and hers are brown.

Her eyes are brown and Mark Hamill's eyes are blue, so there goes my daughter-of-Luke theory. Although, Luke could still be the dad if her mom is Leia, whose eyes are also brown. I mean come on, they did kiss.