Begin removing all the unwanted portions of the photograph by masking them (covering them with a mask). You can draw with the pencil or with the paintbrush tool (be sure you are drawing or painting with black).
As you draw or paint over the unwanted portions, the background color will show through. In this example, I've made the background a grayish rose color. Zoom in close to aid in removing the unwanted portions carefully around the parts of the image you want to remain.
Once you have the mask like you want it, right-click on the photograph layer and choose Apply layer mask.
