Most Helpful Guy
Its a "non factor" for me, if I see a girl who clearly alters and trims her eyebrows then I think, she must like taking care of herself but it doesn't necessarily make me more attracted to her. But if I am interested in her then it definitely isn't a bad thing.
Its like "fashion sense", I don't have a preference because it doesn't change what I look at on a girl. But if I am already interested in her then it does make me feel good that the girl cares about how she presents herself.