I wanted the shadows of the surrounding trees to fall realistically over the model so, after I finished setting up the lighting, I started placing cylinders that wouldn't be visible on-screen, but would cast a shadow over the Giant as he moved by.

I looked closely at the shadows in the photo, and tried to replicate the lighting and the softness/hardness of the shadows.

I feel that I achieved the desired effect, with the denser placement of shadows closer to the camera creating a more looming and menacing feel.