Murder Case: The Secret, Book Poster. Tell me what you think?

For those who have read my first three chapters already for my upcoming novel, Murder Case: The Secret, I have made a promotional poster to encourage more readers and get a feel of what my novel will be like. What you see in this poster, is what you will get. :)

Tell me what you guys think of it. If it needs any kind of improvement, I'm open to all ideas. =D