Eres todo un sueño
I think this is how you say "You're dreamy". Isn't that right? Gracias.
Depends on how it is said, and to whom. If it's the Hero of the movie addressing the villain in a sarcastic, manner, then it means something like: "Oh, aren't you a dream!", or some such.
If the Hero, however, is addressing The Girl, or The Girl is addressing some hot guy, then it means something like "Yum, you are a Dream (come true)!"
Looks more like "You are all a dream" to me.
These might work better, "Eres de ensueño" or "Eres la persona de mis sueños"