As an example modeling someone like Kenny was quite difficult. The advantage of all this though is that once I have modeled a character or object it can be used again in other scenes. So I build up a library of objects to use. Next thing is to arrange the scene so it looks just like I want it. Next I add lighting to the scene.
Lighting adds a lot of the mood and atmosphere to the scene making it look more realistic.
Now all we need to do is add a camera position. This is the location of the viewer and is where you see the picture from. This is the equivalent of human binocular vision. Now all that needs to be done is the rendering. This is where the 3D rendering program calculates where all the lights are and where they cause shadows etc.