Focus in on
Photographs and realistic artistic renderings have their place, but I've found that a more illustrated style helps to define contours and margins of structures in a way that helps us focus in on the most important parts.
Exaggeration with unique angles or "pulling apart" tissues in a less realistic way has been one of my greatest tools for helping myself and others understand anatomy.
Get custom images showing the exact step or procedure you're trying to demonstrate without being limited by camera-accessible angles or lighting.
Dynamic Examples of Physiology
Let me help you summarize paragraphs and paragraphs of written complicated physiology and pathology into comprehensive, eye-catching graphics that help your reader easily conceptualize what you're describing.