Hmm… yeah, i think sepia is just a quick way to make your pics look old. The pic you submitted however, has some more color to it … the faint blush in her cheeks, for example, which is the same as in her dress, which is somewhat in contrast with the grass, which is again picked up in her overall skin color. Alas, i think this is more professional work than a simple ps filter
well, yeah it’s more than just a filter, but that doesn’t mean it’s hard… most things that look distinctive take work. I still think this could be done to a high standard in a pretty short time.