Mid-term exam Shadow producer

In this image I selected the guys from a different picture and copy and pasted them into this one. In order for this picture to look realistic, I had to put the guys into scale with the picture. I scaled them, then selected them again, copy, pasted, then I painted the new layer black. I painted the new layer back because it's going to become the shadow. To make the black layer look more shadow like I applied the Gauissan blur and changed the opacity. After changing the opacity I "free-transformed" the layer to fit the picture and the shadow's owner. I repeated this with every guy.