The iconography of napoleons portraits can be best described as:

The iconography of Napoleon's portraits is the positioning of the image in a vertical position, centered with Napoleon standing and wearing the Colonel's uniform of the Imperial Guard Foot Grenadiers.

We can arrive at this answer because:

Iconography is the term used to describe the science that explains the use of images in photographs and paintings.
In addition to clarifying the images, iconography allows for the classification, analysis, interpretation, and identification of the elements of an image.
In relation to the portraits of Napoleon, the iconography reveals the use of vertically positioned images to accompany the standing image of Napoleon.
In addition, the portrait centralizes Napoleon while he wears a military uniform.

Iconography also presents the meaning of the elements that make up an image. In the case of Napoleon's portrait, the elements are positioned to represent grandeur, control, and military power.

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