Try adjusting the light settings to get the depth to show. Try this: set the first light to a sun with a setting of 1.25 and white in color. Set shadow intensity to 100 and turn on ZMode. Move it so it is in the middle of the top left corner of the screen. Set Ambient Lighting to zero. Turn on another light. Set it as a sun with a bright orange or red color and intensity of .6 Turn off the shadow for this light. Move it to the middle of the bottom right corner. Now adjust your material brightness to around 15 or 20 you may have to experiment. Turn up the diffusion to 80 or higher and adjust the diffusion graph so the curve of the graph is very slight from top right to bottom left corner…it should look almost like a straight diagonal line with a slight bend. You can experiment here as well. You can also make adjustments in the RENDER menu. Under ADJUSTMENTS change contrast to around 20 and brightness to around 8. Experiment with all this and let me know what you think. These are the base settings I usually use when setting up my renders.
By the way your modeling is improving greatly…keep up the good work!
Edited: Here is a quick picture demonstrating what I was talking about. All the circled areas are the adjusted settings mentioned above. The picture on the left is rendered with the basic default settings and the picture on the right with the adjusted settings. You can tweak many other things as well to increase the visibility of the model such as specularity and the specularity curve…using more lights. Changing the ambient light setting and the ambient light graph etc. Just experiment. There is a lot of power in the lighting/render settings.
Another addition:
Here is a pic and a live .ZBR file that you can unzip and look at. You will be able to see all the settings I used.
Here is the ZBR file:
Accountant.zip