Working with the screen is finished. Let’s begin representing the buttons now. Select the Ellipse Tool (U) and picture out roundness, but we should change the placement of the upper point the way it is shown below:



Apply the gradient for it and select Blending Options>Gradient Overlay:

 

 



Make a copy of the layer and make it smaller:



Apply the gradient also:

 

 



Next select the Blending Options>Inner Shadow:

 



Blending Options>Drop Shadow: