Are there any good drawing programs for the unartistic?

What I am thinking of is the ability to place predefined images into a scene and also to edit the images. It is sort of the computer analog of decorating a room by moving around furniture. There may already be CAD systems that do what I would want.

As I see it, everything would be in 3D. You could adjust the camera position and angle.

Every object would be broken down into pre-defined components, which could be individually edited. You could also resize the entire object.

Objects would have pivot points that would allow, for example, movement and rotation of a person’s limbs.

The basic idea would be to have a lot of things be done automatically. For example, you might be able to select a person’s clothes or hair style and the program would automatically adjust to the size of the person. There would be limits on what could be done in order to make the program easy to use.