She'll learn to love it. I have several Star Wars posters around the home (a little less subtle) and the wife surprisingly likes them.
Also, where did you buy that from? I am forever looking for collectable Star Wars prints.
I think it looks awful, the colours don't go with the rest of the room.
It's only fair to offer her another choice, like on the ceiling above your bed for example.
I think you need more cushions.
the mrs has a thing for them haha
I don't think chasing your wife around the house is going to do much with regards to getting her to like the poster.