Possible Clues:

• "Not in the picture"
• Averse to posing
• Out of the picture, maybe?
• Unhappy with one's image, perhaps
• Chaser may be apprehensive of having photo taken - bashful?
• Disliking being snapped at
• Averse to picture-taking
• Snapped only under pressure?
• Fallen arches may be difficult to photograph
• Like someone who's snapped under pressure?