I don't have photoshop; just got a very basic editing suite that lets me resize, crop, etc. fine but in terms of effects it's extremely limited. The only time I ever did anything to a pic was on
this one because even though I took it at dusk it really didn't look that different from any daytime shot. I wasn't overly impressed with the results and haven't bothered fiddling with anything since. I've never added SFX but I did use MS Paint to do speech/narrative and a fancy comm-talk panel for my
mini-story and it took way too long for what I got!
As for location, I much prefer going outside. Natural light always looks best in my pics and I'm fortunate to have a back yard available with lots of different environments. Plus, being 6'4", it's nice to have room to stretch out when I'm lying on the floor looking through the viewfinder. Plus getting some fresh air and sunlight is always a good thing!
The main reason I prefer outside, though, is probably because I'm lazy and it means I only have to set up & pack away figures rather than mess around with sets & lighting too...!