I quite like the original as it is, but the other samples are more like the effect you get with old black and white pics that haven't been washed properly and have gone that warm sandy color. Proper sepia is a very subtle cool brown color. Convert the image to greyscale by using the channels command, using the sliders to get the tonal effect you prefer. Change back to rgb and put in a subtle color cast using the color balance controls. Try for a start about 6 yellow and say 4 magenta. Try also selecting mid tone for the yellow and magenta and the highlight control for a more bluey tint. It needs to be very subtle. You could also try the 'dual' tone effect to give a subtle color change.