Not too bad for a first attempt. There seems to be a reasonable tonal range, color, etc. I've always found that HDR with a million tree's like that can be difficult, as the slightest breeze can cause ghosting (the branches won't line up perfectly). It appears like you
only edited them in Photomatix--which is okay, but won't get you perfect results. For example, the below image was brought into photomatix, merged, exported to photoshop, I recut the sky onto it (photomatix had
a lot of ghosting in the clouds), I brought it back into lightroom, and finished with contrast, clarity, the works. I've found that solely using photomatix leaves images...85% completed. The extra touch of photoshop or lightroom really makes a difference.
Just Photomatix:
Final:
A Calm End by
f_one_eight, on Flickr
Also, try and make sure you're highlights maintain detail. In the water on the left-hand shot, the whites are
pure white, with no definition. Your central exposure could have been 1/3 or 2/3's of a stop less (a bit darker).
Best,
Jake