This is a close-up of the image on the next page.  In the large one I used a Hoya fog filter.  In this one I made my own. Get a thin piece of clear plastic like the drawing below.  Cut it so it fits into your lens shade and cut a hole in the middle. Use a felt tip pen to color around the hole. You will get a vignette like the one you see in this image the color of the felt tip.  The strength of the vignette depends on the f-stop.  It takes a little experimentation to get what you want.  Notice how her hand just rests on his.  People always look at the hands so pay attention to them.