Your focus and exposure is good. IMO its score will suffer for a couple of reasons. 1) While it has some 'cute' factor, the chipmunk is too small to really get max impact. 2) The direct flash(on board i'm guessing) takes the mystery out of the situation. Think of some cross lighting raking accross the guy, just giving him some shape and illuminating the person's hand.
Think next time about your shooting angle. Lay down on the ground. Get close! We all like chipmunks so show us an intimate portrait! ;)
Not a great entry for the "Best of" challenge. The direct flash doesn't work here nor does the composition. My family does a lot of camping in Central Ontario and one of the highlights for the kids is feeding the chipmunks. When capturing those images, I like to use a narrow DoF as well as include the expression of the kids as the chipmunk takes the peanut (or whatever) from their hand.
The image is well focused, but unforetunately, I do not see this scoring very well. Sorry. Good Luck. 3.