It's a neat photo, but I think I'd play with some crops. In my mind, the spider is the main subject, and it's gets a bit lost in there. Mine would chop off a lot. Left crop would be halfway throught the yellow of the flower, top would be just about the pedal to the left of the spider, bottom would stay the same, and the right would be determined by the 3x4 ratio. You still get the impact of the yellow and white of the flower, but the spider becomes much more important.
It also looks like it's been oversharpened. You can see the artifacts around the spider. I don't know if you sharpened in software, but if not, I would turn it down in your camera.
I think the DOF is perfect, if you go with the crop.