Give some volume to the grating:
Blending Options>Bevel and Emboss 
Insert the shadow
Blending Options>Drop Shadow:
Place the screws on the edges and the grating is finished!
We can represent a kind of reflection also, just to make the picture nicer. In this case we’ll choose the appropriate instrument when using the
Shift button to represent by one rectangle under each music box:
Blending Options>Gradient Overlay: 
That’s it! The lesson is finished. Good luck and success with your inspiration!
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