First trys are always fun. Bringing some depth back in is always a challenge. Just sliding around some of the sliders in Photomatix will geive some crazy images. As mentioned above, bringing in some shadows etc so the picture does not look like it has no depth.
Any of that I do in Photoshop after doing the merging and tonemapping in Photomatix. And I still don't know of one image that I am totally happy with. It's always a struggle between adding some pop and detail vs. realism.
This is one of the ones I like. I find lowing the gamma in photomatix, then in photoshop some selective color seclection of shadows copied to a new overlay layer around 10% opacity, some overlayed high-pass layers, some selective masking of them etc are good starting points to get rid of the washed out texture look. But to each their own