Why did you

decide to withdraw a photo from a Challenge?

I wonder if there is a most common response.

Invitation to a survey: Use any of the below or write in your own reason.

Reasons I can think of:

decided I didn't like it
upsetting criticism
subject was unhappy
too personal
afraid someone might steal it
afraid someone might copy it
tired of throwing pearls before swine
protest against ranking of my picture