I think I would prefer a top-view of the spider, here it just looks like a bundle of legs and you can't see much of his skin's (?) detail or pattern. Something has really been munching on that leaf!
HOLY GOD IS THAT AN AMAZING BUT GROSS PICTURE!!! IT GIVES ME THE CREEPIES LOOKING AT IT. HOW YOU GOT THE GUTS TO GET THAT CLOSE TO A SPIDER THAT LOOKED LIKE THAT IS BEYOND ME!!! I COULD NEVER DO IT!!!! EXTRA KUDOS FOR BRAVERY!
On another note the picture is great and simple. I like the lighting an composition. Its clear and you can understand what it is.