Here’s my composition
Different from the course, I added a texture material on the shadow catcher plane using the background image. In this way the road texture is also reflected on the high reflective material of the object (for instance on the chromium plating of the bike weels),
The way to do it is simply to unwrap the shadow catcher plane using the function “project from view” once viewing it from the camera. Pretty cool, isn’t it? I love Blender 
