"how it looks like" or "what it looks like"?
Tell me how it looks like.
Tell me what it looks like.
The rule
Use "what … like" OR "how …" — not both. Say "what it looks like" or "how it looks," never "how it looks like."
"Look like" and "look" take different question words. "Like" pairs with "what" (what is it like?), while "how" stands on its own (how does it look?). Putting them together gives the very common "how it looks like."
More examples
I know how it looks like.
I know how it looks.
How is she like?
What is she like?
How does it taste like?
What does it taste like?
How to remember it
"like" needs "what" (what's it like?). "how" goes alone (how does it look?). Never put "how" and "like" in the same question.
Frequently asked
Why is "how it looks like" wrong?
Because "like" already asks for a description and pairs with "what." Use "what it looks like" or "how it looks" — using both together is redundant.
Is it the same with taste, sound, and feel?
Yes. "What does it taste like?", "what does it sound like?", "what does it feel like?" — all use "what … like," never "how … like."