Firstly, the image quality is not so good. Second, I do not see how this fits the challenge. I am wondering if you knew this was the candid challenge, and not the childhood challenge. (?)
I am guessing you tried to meet the "Try to emphasize the mood of the moment" of the challenge and I do know what happens when you put salt on a slug. However, I do not think most of the viewers on dpc can make a similar association. I could see this image working if you had zoomed out a little more, had it slightly more in focus and had a slow shutter speed to show the slug twitching and squirming after the salt is placed.