No offence, but I see it more fitted in Photography / Animals, Plants & Nature / Sky because I just used a gradiation filter. Not manually but digitally. So more a normal picture than HDR. And btw, by this standard at least many of the popular Animals, Plants & Nature Pictures on this site should be marked as HDR. Just look at this [link] or this [link] or this [link] The difference between normal editing and hdr is often small so it's a matter of opinion.