Kelly Drive is also a popular spot along the Schuylkill River that can work out nicely for photos.  Along the running trail and the river, it has some blossoming trees that work well for photos in the early springtime as well as some terrace areas with some nice landscapes along the way.  Its just a short walk from Boathouse Row and the Water Works for couples that want to finish off a nearby session with a few shots along the riverside to add some greenery and hopefully a beautiful sunset in the backdrop.