I've seen too much sepia tone over the years - many years ago my boss told us (those developing print projects) that he didn't want to see any more sepia, so we always had to made a good case for using it. I'd be tempted to save that as a gif or keep it as a png and try hand coloring it, make it look like the old post cards. Blue sky, green or gold grass, etc. Enlarge it great big and use a small brush to stay in the lines. :)

SRS