2D Photo to 3D Environment and add object

So Im turning this pixelphoto into a 3d environment using vanishing points and then returning the 3D Layer to Photoshop. Cool, I now have kind of a 3D environment. But then I try to add a 3D object to it and the environment doesnt seem to catch shadows or reflections.  To be exact Im turning a corridor into the 3D Environment and I want to add a character to that corridor and I want his reflection to hit the ground floor and his shadow to be going up agains one of the walls.

Plus the character gets distorted like crazy when I merge the corridor and the character 3D objects. What am I missing guys