arty, this is such a precious shot! i love the colors and the DOF here...and those faces are adorable!
i'd like to make a couple of suggestions...you have some really strong lines in your background from the fence posts and i think it's important to make sure those are straight. also, the highlights on the fence compete with the lighting on those cute litle faces...especially the horizontal line that runs through the shot. if you tone down those background highlights with a burn/blur, it will make them much less distracting. this is what i came up with:
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