The frog looks to me liek it is more centered than 1/3 off the edge. I think tighter crop from the right woul dhave made this somewhat stronger. Just my 2 cents.
I like frogs, and usually images of them really grab my heart. I find this one to be lacking in punch though as there really isnt much contrast here. The other problem is the composition. To meet the rule of thirds, the frog should not be so centered, as that is your subject. I think it would do better if the frog was along the lines of thirds both horizontally and vetically.
This is great capture however the froggy seems to be in the dead center. Why not crop ot to fit in one of the intersections. Guess you'll be preparing for loads of comments like this one. Sorry. I like your shot I the tip of the froggie's nose ti near being 1/3. :) 7