Ok, your suggestions are quite good. But it depends on the tone you want to use, obviously you would not (or at least I would not) tell a lady "you're hot!!". 1. Estás buena / estás buenísima: That's probably the most accurate. 2. Estás guapísima: I would probably say "eres guapísima", "estás guapísima" would be only for that right moment -like "you LOOK hot", like for someone you already know (and usually doesn't look that great ^_^), while "ser" is more like "you -actually- ARE hot". 3. Estás monísima: Sounds more like what my mom would say to her. 4. Uy mami estás deliciosa: I guess it is more of a specifically south-american compliment (not wrong, just not that universal). That's in regard to the ones you mentioned. I'd personally tell her: "Eres preciosa": Like "you're beautiful". "Precios@" is an adjective which sounds extremely good in Spanish (at least for me), you can use it to describe any nice things you find in her "tienes unos ojos preciosos". "Pareces un angel caído del cielo": You look like an angel that felt from the sky. (ok, I guess that'd be more for your gf). Then you can use funny sentences (probably not working for me, but I'm sure they're better with some foreign accent :P): "Estás para mojar pan": Referencing the habit of finishing a dish by picking up the sauce left with pieces of bread. "Eso es andar y lo demás es joder el suelo": That's walking, the rest is just "fucking" (like ruining) the floor. Finally, give it a try by looking different "piropos" (compliments) in google: http://www.google.es/search?q=piropos