The trick of embedding subjects and objects into environments is getting the gravity right, giving weight to the newly positioned elements. It so easily for it to look flat and pasted. A lot of attention has to be paid to the edges of each merged item. Details like tiny strands of hair and blades of grass help cover the seams and add believability. While it might sound tedious, this is my favorite part. The saying that the angel is in the details really applies here. In the end, if I succeed at creating a convincing illusion, it feels like magic to me and that's what I live for.