Press-and-hold the Command key (PC: Control key) and click on the layer thumbnail of the copied layer (Layer 1) to make a selection of your image. Click on the Create a New Layer icon to add a blank layer above your copied image layer, and then choose Edit>Stroke. Use a fairly thick stroke width, and change the Location to Center. If appropriate, you can use a color you sample from a dark area of the photo, by clicking on the color swatch, and when the Color Picker comes up, moving your cursor over the photo and clicking on a dark color. Press Command-D (PC: Control-D) to Deselect.