I’m presuming it is actually HDR as you’ve added it to an HDR Group on flickr. I don’t normally comment on an image if it’s HDR but as this looks so natural I have to :D Beautiful image and excellent composition! But you already know that.
I’m not sure if it’s my screen or not but I’m seeing slight banding in the top left corner. Also there’s what looks like a bit of flare or else a dust spot in the top right but that should be easy to clean up.
I’s say this photo would do well on Alamy or istock or one of the other stock libraries by the way.
Mark.