The reflections help to add realism to this model.
This Rendering Tip will show you the advantages of using Reflective Surfaces to create better renderings.
One of the best things that you can do to improve a rendering is to focus on the details. It’s the details that can increase realism of a rendering and one detail that many users over look is adding reflection to all the materials in a model that need it. Not only that, but you must also apply the correct kind and the correct intensity of a reflection to a material.
Users normally apply reflections to the noticeable objects in a rendered scene such as a mirror but often forget about the small objects like a table top, or a door knob or other accessories. Spending time on these details can make the difference between a boring, flat image and an engaging, realistic one.