The elements in a mind map are organized in an intuitive way according to the importance of the concepts: the main concepts should be highlighted in a special way (different color, size, underlined...) so that you can assimilate the main information easily; the secondary concepts should be highlighted in a different way and so on.
Besides, the concepts are placed in bubbles with connections between them.
The organization of all the structure should be clear and easy so that the image can give you a general overview of the content.