How do you beat Eye to Eye in the secret room and snowman lost his head?

Okay. I had trouble with this too. In the eye to eye level, you have to be Luigi. You go in the room with the books and chairs that hit you. I believe it's on the second floor. There is a platform in that room. When you enter the room, go to the right hand corner and there is a platform there with a red box. Hit the red box and do a back flip onto another platform. Then there is a door there. Enter it and jump into the painting of the boo. There is a big Eye and defeat like you would any other eye(by circling around it a couple of times) Then when you defeat it, you get the star.

Now, the snowman's lost his head part. I had trouble with this too. When you start, go on top of the cabin and onto that platform where the baby penguin is. There will be a brown wooden platform. It has a body of a snowman. Go up to it and it'll say that it needs a head and it'll follow you. So once you're done talking to it, You slide down the mountain without letting the body pass you or fall. Once you get to leveled ground, you'll see another brown platform this time with a snowman's head. Stop at it and the body will come rolling down the hill and bump into the head and will become a full snowman. The snowman will thank you and give you a star.

I am happy to help you.