Read the diagram's structure
Observe labels, arrows, colour, and simplified shapes. Ask which relationships the diagram makes visible and which it leaves out. Clarity is a design achievement, not proof that an image is complete or appropriate for a clinical decision.
Consider the human subject
A portrait and an anatomical image assign different roles to the person depicted. Examine viewpoint and context while keeping dignity, consent, and historical circumstances in view.
Check the image's purpose
Distinguish teaching, documentation, persuasion, and artistic interpretation. Use captions and edition notes to understand the intended setting; avoid treating a historical image as current health information.