I experimented in the darkroom with highlighting certain areas of my photograph. I set up my enlarger and lined up the photographic paper with the projected image. I placed a piece of glass over the photographic paper so that the paper wouldn't move. I placed a selection of coins on top of the glass in certain areas. I exposed the image for half of the exposure time, 3 seconds, then I removed the coins and exposed the image for the remainder of the time, 3 seconds. This creates an effect where parts that the coins were are lighter than the rest of the image. I think this will work particularly well with an image with areas that should capture your eye.