I love reading those words, "this is my first HDR" and one finds that the photo looks processed by someone who has had years of experience with tonemapping and HDR rendering.
The details here are flawless and the colors are superbly in balance. Though a slightly more impacting subject would of been more interesting, the reflections though, prize the image.
Its a shame you could not walk the other side of the bridge and have that as a left marker and then the church as a main subject, with the trees then marking out the right side. As a HDR that would make a huge impact because the details in organic and manmade would be far more emphasized.
In All a great HDR that shows an eye for the reality of the image rather than going to far into the heavy detail aspect as so many people do with HDR.

Great work.