Okay, so now I feel bad - I went away for a couple days and now there are all these great comments about the background lunar landscape. That's the Photoshop part! Yes, CG_Addict - that's an image from an Apollo mission but with some significant Photoshopping to clean it up and patch in some additional detail. I matched the lighting environment from that background image in my Modo scenes that set up the astronauts and rover and lander (with associated shadow catchers). For the astronaut in the shadow of the rock I had to create a (hidden) mesh object to shadow the lower half of his body that the image shows should be in shadow. It was all about 'reading' the image and trying to fit the astronauts etc. into the scene in a semi-believable way and have all the lighting match as best I could.
So, sorry to say, I'm not that skilled yet in driving Modo to make a good lunar landscape! But I hope the doesn't tarnish the rest of the image :-)