Blending Options>Gradient Overlay



Blending Options>Gradient Editor:



We should get a picture like the next one:

 

Make copies of both objects and place them upper than they are.



Next we have to represent a muffle shadow on the entire picture. We’ll use for this operation the Rectangle Tool (U) that must be applied on the entire picture, using also Blending Options>Gradient Overlay



Blending Options>Gradient Editor



Fill 0% for this layer.



And we’ll get: