I won't comment on the HDR treatment as I usually don't like it and LaFoto already did. I usually really like the portrait orientation for landscape shots but here I don't think it works very well, probably because you placed the horizon right in the middle of the picture. I can't decide wether the subject of the photo is the sky or the landscape. I would try to include less sky and include something interesting in the foreground (such as a boulder or a plant...) at the bottom of the picture.
Also next time you go there, try to take shots with a polariser and/or a ND grad filter on the sky to avoid the HDR treatment. Compare them with your HDR pictures and see which ones you prefer.