Don't forget to apply shadows to the reflected objects; this is a critical component to selling the "3D object reflected on the floor" effect.
Refer to the image you posted.
Shadow:
Load the trans mask of the object as a selection, and on an empty layer below, fill it with a black-trans gradient from bottom-top, distort it to lay on the horizontal reflective plane toward the vanishing point, blur the shadow slightly, then set the blend mode to multiply and the opacity to 25%.
Tweak this basic procedure to achieve a realistic shadow.