You can say "Eres bonita".
bonita
You can say "Ella es bonita".
mujer bonita
There is no direct translation for "pretty please". Simply say "Por Favor" (please).
You would say "guapa pero gorda".
You can say "Ella es muy bonita".
You say it pretty much the same way you say it in English: xenofobia.
un bebe guapo/a
usted no es bonito
chica bonita
me gusta verme bonita
El edificio es bonito