Here are demonstrated the parameters for the Blending Options>Gradient Overlay: 



Gradient Editor:



Fill 0% on the layers' palette for the last made layer to get the same result from below:



Make a copy of the last layer (Ctrl+J), placing it a little lower as the next model indicates it.



Choose on this stage the Brush Tool (B) and then select the same brush out of the table we have below:



Represent a line on a new layer the same way it is shown below:



Select the next shown parameters for Blending Options - Drop Shadow.

 

Blending Options - Outer Glow

 

Blending Options - Bevel and Emboss



Now we'll represent the shadow for the apple, but for this operation we'll apply the brush on a new layer.



Insert a kind of spot, transforming it after that with Free Transform option (Ctrl+T) into a flat shadow.



Place the layer containing the shadow under the apple's one.



Finished!

View full size here.

Inspired from Fruity Apples by Benjigarner