"Vous êtes un très bon artiste."
This translates to "You are a very good artist."
Here's a breakdown of the corrections:
* "Vous êtes" is the correct conjugation of "to be" for "you" (plural or formal singular).
* "un" should be placed before "très", which means "very".
* "bon" is the correct adjective for "good" in this context.
Let me know if you have any other French phrases you'd like me to translate!