Use some value degration. Either dark in the front and light in the back or visa versa. The ground is all one light tone. Its should probably get dark in front and fade to light as it goes back. The bear needs a shadow in the direction of the sun. Toss a few "anchor" objects around the bear to clamp him to the ground. Also, sink him in a bit so his paws are a bit obscured. The tree in front also needs some shadowing. One problem people have with shadows in Poser is they don't realize what a shadow map is. If you ground has shadows turned on, it will fill your shadow map with black and your objects won't shadow. Think of it this way. Imagine a camera is put at the light and a monochrome pic is take. Anything of substance is black and anything the light passes by is White. Poser uses this map to render its scene. Now if the ground has shadow turned on, the entire light map for that light will be black so nothing else shadows. If you could pry up the scene after rendering you'd see a shadow for the ground. Nice pic.