with a black brush with blurred edges to dark out the lowest and the left parts of the marked place.

Using on the central picture’s part, create a black layer for the buttons. On the new layer with 2×2 px you should represent this element:

with the indicated tool . The figure’s color must be 898989. Apply the demands from the table.

Apply the next indications:
Blending Options-Inner Shadow

Then choose
Choose now Blending Options-Pattern Overlay. Here you may find the necessary created recently cliché and set these adjustments from the table.

As a result we’ll get this: