What does estas Bella mean?

You are beautiful

NOTE:

Eres bella also means You are beautiful

Estas is a temporary state. Eres is a permanent state.

Estas bella means you are beautiful RIGHT NOW...in dress, in make-up, in current appearance.

Eres bella means you are beautiful ALWAYS...you are a beautiful person.

The temporary state is NOT a backhanded complement. It is a way to to tell some one they look good in the way they are dressed or made up!