.....to tell a work colleague of the opposite gender that they look beautiful or handsome or would that be professionally out of line?

Would you be a bit suss if one of your work acquaintances told you how ravishing you looked?

What comments would cross the line?

"Wow I like what you have done with your hair today"

"That blouse really shows off your best assets"

"That black bra really becomes you"

"Hey is that a mirror in your pocket because I can see myself in your pants"

"There is a party in my pants and your invited"