Leave it to Our Imagination
Most authors are required to convey their message through words alone. They allow us to envision worlds and ideas that they create without offering a single image.
And yet, they always put their mug on the book jacket in the "About the Author" section.
This is a mistake around 95% of the time. I like it better thinking you're not a nerd. Let me envision you. Stick to words. You're great at it.