Alessandro, you are crazy ;-) Wonderfully imaginative, this made me laugh, fantastic idea! I would definitely look at a Banana Wrestling competition if it existed :-)
the foreground banana looks more like a shadow than foreground blur. It should either be solider or thicker. But otherwise this is a hilarious, great image.
great blending on the face to the banana.
the arms have some hard edges but only a minor detraction.
as someone pointed out recently, if you duplicate the item in another layer, apply a blur and set opacity to a low % value you can soften up your edges a bit more
overall i see this finishing well in this given some of the other entries i've seen