Don't pay any attention to the 48 c-index rating on your shot. There is an excellent photo hiding inside this very good photo. Since it is very nearly "tack sharp" in the center, you don't really need the peripheral material. I would suggest cropping it down; on the bottom to just above that extra branch, on the right about halfway between the end of the extra branch and the mushroom, on the left a short distance left of that dark round spot, and, after resizing the width at 1500 pixels and the height at 1000 pixels, this should place the shroom in the right half of the photo and the top of the photo ending near the bottom of that white vertical line in the dark background. I pulled a copy off Caedes and tried it myself, placing a 12 pixel black border around the remaining shot, followed by an 8 pixel border using the bright yellow-green in your photo. I then expanded the canvas to 1200 x 1600 pixels, filling that extension with black. The result is dynamic but yours would be even better since you'd be working from a copy of the original. Just a thought.
Nice macro, as above ignore the rating. About half the people here will give a low score to something with a shallow depth of field. I like the shot. I think I would have liked it better without the branch, but it's hard to say.
good variety of colors and edges, but watch out for tangents: the end of the branch is to close to the edge of the mushroom. Just a minor composition observation.
-Nikoneer