Here is the "normal" auto-exposed photo, which I tweaked in Photoshop using curves and levels. Nothing special.
When I merged six images into the HDR program, and then tweaked them using Topaz, I came up with this:
Yikes! Not what I was expecting, not at all realistic, but it is very dramatic and "artsy," which I do like. The clouds ended up with some pink highlights - I have no idea how that happened. Later, however, when I looked out the window again, I did notice some pink in the clouds and the sky. It was just a lot more real looking than the HDR photo, which seemed to harden that pink color.
I can tell I will be having a lot of fun learning how to do this properly!