I did a edit of a photo of an Abrams tank and inserted a Space Marine and a Land Raider into it, then a carnifex, all based on official dimensions. I did this because I wanted to see how big a Land Raider would look like on a photo compared to an Abrams tank and a human of close to (1.8m) average height. It is not just inserting images, I have to heavily edit them to make them work in the lightconditions of the original image, the Carnifex alone required some mattepainting on it.
I put this up on reddit and people liked it so I thought I would put it here. I am going to add more factions to this photo.