I also wish the depth of field might have been pushed a touch further - it seems to me that the magic in such mega-close photography doesn't really reside in the artistic effects of shallow depth of field. Even without the ant, you might have had a quite magical image here.
For me, it's glory lies in in your chosen composition of the angles of stem and leaf, and in the scattering, the feeding of the aphids. I could not pretend to be moved, atristically by this photo, but sure as hell my scientific curiosity is engaged. I like our thoght processes too. for a successful portrayal of those thoughts I think you'd need o catch the ant in plainer view, perhaps even taking one of those sacs of fluid - however difficult that achievement is, photography of the natural world surely depends upon a patience beyond that the rest of us have to put out.
The light is handled very well, which is a strong point here. As to all those 'eww' comments ...
Great macro... disgusting, but very well executed. There's just something about maggots on a branch that just makes an interesting shot look kind of gross.
Great composition and pretty good focus. The processing remnants present in the shadows around the ant are a bit of a distraction though. Still give you props for creativity and an overall appealing shot.