Also, another quick tip. I can't pose full body shots for some reason. They just turn out crap. So I fudge it by using medium shots all the time. They end up looking much better because the picture looks fuller. In reality, I've just zoomed in more so the characters cover more of the screen.
In my shitty old pic above, you can see that it's just an overwatch soldier with a gun in front of some helicopters. Pretty bare. But there's an illusion of substance just because the frame is filled. It also takes much less time to pose (~15 min). Then just slap on some
lamps,
fog,
film grain,
preset photo filters and
lens flare and you're good to go.