Nice colors and concept. In general, DPC'er vote down on images where the foreground is blurred and the background is sharp, This is not always true, but a generalization. Here, it looks like you got your focus on the yellow swing. I would think about focusing on the red swing and setting the aperture to something like f/13 or higher so that the depth of field falls off gradually at the blue swing.
I think the out of focus front swing takes away from the shot here. Focus on the front swing and use a smaller aperture to increase DOF and you have a real winner.