Most Helpful Girl
It's just a compliment. It's not like you asked her out on a date1
Most Helpful Guy
It depends on ur girl dude... if she is possessive than ur cheating her..
but if she doesn't feel that bad... then its fine1
It depends on the way you say it. Just saying "you're beautiful." sounds a little too intimate. But saying things like "that looks nice on you.", "you look good.", "your hair looks good that way." Sound more innocent and friendly, pretty much just sticking to the words nice and good.
That's just my opinion though.
I rather you stay silent...
In most cases, certainly not.
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