Yeah, I'm an amateur photographer too and I can't stop taking in-game pictures in SC... -- especially since the release of 3.3.
I finally learned how to manipulate DoF -- for some reason the default DoF key bindings didn't work for me before -- so I can now make pics the same way I make them with my camera(s) in real World -- with a shallow depth of field.
Add appropriate lighting to that and you can produce amazing pictures... / As for the light, believe or not, I've been waiting for sunset or sunrise for more than hour few times, only to take a cool picture. I've been doing the same many times in real World ; ) If the light is nice, you don't even have to post-process image later.