Select on this stage the Ellipse Tool (U) to draw a kind of rivet, colored with #8B8B8B, placing it the same way shown below:
The layer’s parameters: Blending Options>Drop Shadow
Blending Options>Bevel and Emboss
Blending Options>Bevel and Emboss (Contour)
Make a copy of the last made layer and choose Free Transform option to place the copy, like it is indicated below:
Next we shall use a standard brush of white color to draw a kind of frame, like the one demonstrated next picture:
Take the Eraser Tool (E) to clean out the picture’s edges, applying the same brush:
The picture is finished!
View full size here.