Would you write How did it look like or what to be correct?

"What did it look like?" is the grammatically correct way to phrase the question.

The phrase "How did it look like" is grammatically incorrect because it uses "look like" as a verb phrase. "Look like" is typically used as a phrase to describe something's appearance, but in this context, you're asking about its appearance.

Therefore, "What did it look like?" is the proper way to ask about the appearance of something.