Too much halo above the structure. This is caused during the process in Photomatix.
agree with jphoto
You need a little help with Photomatix my friend. Help is available on this site. Just ask.
nice textures, but a lot of problems
There's a tendency in all of us when first using HDR to over process the image. It's a place we all begin because of how unique the shots look, but as you refine your skills, you will produce really great shots.
Love the subject. Your process will improve with a few pointers. This is just the place to get them :)