What does estass ermosa mean in English?

Answer 1

You [look] so pretty.

Literally: you are so pretty

The difference is the use of the word Esta instead of eres.

Estas is a temporary form of "are". (Estar)

Eres is a permanent form of "are" . (Ser)

So "eres tan bonita" = you are (always) so pretty.

"Estas tan bonita" = you are so pretty right now.

This statement is generally used to compliment someone on the way they look in a dress, suit, make-up, hair style, lighting, or even a specific situation. Something temporary.

Answer 2

You are beautiful