Head and shoulders image, facing forward (or slightly off angle of directly forward), head fully in frame (not tightly cropped).
Neutral or plain background.
In focus (sharp).
Professionally produced (no cellphone photos).
Image must work in a 5:7 5x7 image ratio (portrait/vertical orientation), when cropped for the website.
High-resolution (1-2 MB file size).
Taken within the last 3 years.
Permission/license/release to use, if taken by an independent photographer.