Three general guidelines to remember in trying to represent 3D in 2D. 1) Light surfaces appear to be closer, darker surfaces appear to be further away. 2) On a curved surface with uniform markings, the markings will appear closer together as the surface curves away from the observer. 3) Sharp details appear to be closer, blurred details appear to be further away. Of course you will occasionally violate these guidelines for good reasons, but they will help in determining how to achieve the general effect. - Ken Heronheart -