nice,
bit of chemistry of film :
on a high speed film (used so image doesn't blur) the silver halide crystals are larger so that they pick up the light quicker, meaning a quick exposure and a frozen image i.e no blur.
so if you want to get a good likeness think off these things:
add more noise to image:
maybe actually reduce resolution to pixalate it a bit then add noise and blur
do you have burn, sponge, tool can help to darken areas
just ideas you might want to think about
also that colour is called sepia,
hope these tips help

(I used to retouch proffesionally am know a 3d artist.)
p.s also dont over do fancy effects as it always looks false keep it simple.
again nice piccy
