Here are some correct ways to say that in Spanish:
* ¿Cómo te ves? (Formal, literally "How do you see yourself?")
* ¿Cómo eres? (Informal, literally "How are you?")
* ¿Qué aspecto tienes? (Formal, literally "What aspect do you have?")
* ¿Qué tal te ves? (Informal, literally "How are you looking?")
The best choice depends on the context and your level of formality.