Now that you have read the previous chapters about lights, background, and depth of field, lets explore further into photographing the details. We will need all of those knowledge here.
Why do we need to show the details of a miniature-models?
The intricate details of a miniature-model will clearly show the effort done by its builder. In an overall photograph, which shows the whole body of the miniature, a poorly built one will still be able to look good and nice. Only by showing the details that people will be able to see its build-quality.
For example, let's see the photo below:

This 1/48 scale
P-38 Lightning
looks nice and beautifully built.
Isn't it?

Now look at the details below

The cockpit framework is shoddy, painted using brush without masking, and seems as the brush-tip was not fine enough. The modeller ignored the fact that silver color is very sensitive to brush mark.

The gun bay is not well built. Look at the painting of what supposed to be the amunition; yellow painted without any effort to create impression that it is portraying a belt-fed amunition. Definitely it is not that kind of paintwork which deserve praise.

From this detailed photo, we can see that the modeller did not make any effort to sand off the moulding line on the rocket rack, even the wing still exhibit the joining line at its leading edge.

Now lets look at another miniature-model:

a P-51D Mustang, also in 1/48 scale, and silver-colored.
By looking at the details pictures below, one will agree that this miniature-model was built with higher workmanship quality than the P-38 above.
Although this model looks like a brand new aircraft rolling out from the factory, lack of weathering, but unarguably the modeller had put an effort to get a fine finishing.
The detail photographs tell about it.

What kind of details do we need to show?

Generally, the common details which most people will show are:

- Intricate details which is hard to build or paint
- Unique feature of the model
- Tiny details/items which may be hard to see without magnifying glass

Well built models, especially today's sophisticated ones, will contain a lot of details; cockpit interior in an aeroplane model, mechanism of an artillery gun, dashboard of a car, even an expression of a figure's face.
Therefore photographs of the details will talk a lot.

Tiny details which can be very hard to see by naked eyes, can be showed up in a macro photograph.
For example:
the photograph on the right, a Deutsche Bahn passenger coach, in 1/87 scale, its route-plate is very small, some of the words were unreadable by naked eyes. But a macro-photograph of this plate reveals all of the words. (See photo below)

How to photograph the details?

Place the light on the direction which you think best. This light must be "soft" (please see chapter 2. Lights), and bright enough to allow photo taking at high f-number. Yes, you have to use the highest possible f-number.
On the opposite place, put a reflector (a white paper will do) as close as possible to the miniature-model (but still outside the view-finder).

Don't forget to put the camera on a tripod. This kind of photography will deal with very thin depth of field (see chapter 5. Depth of Field), a slight movement of the camera during exposure means the photo will not come out sharp.