DoF is always a tricky thing when dealing with macro images. While I generally like a narrow DoF, in this instance it strikes me that the blurred foreground takes away from the interesting features in the center of the image. Not enough of the plant is in focus IMHO.

I think that the DOF is either too short, either too long. That's a difficult subject with a complex shape. That's not easy to have a direction, a strong pattern. You have disturbing dust on the leaf that could has been removed before (ouch!) of after the shot (with post processing). You have made a good job with the light at the shot. You could now ajust the levels to give tonus and eliminate a small voile.

This is such a cool subject that provides any number of ways to shoot. I am not sure that I agree with the DoF comments, I can see that there would be possibilities with this to do a series and focus on different parts of the leaf and let the rest fall out of focus. Having said that, I agree with Fantome tht there could be more work done on the levels to make the whole image more striking.

This is a strong photo - good comp and good color - for me, the dof is fine for what this photographer was trying to accomplish.