I like the 'Valley of Fire' shot much better than the 'Mesquite Dunes'. Not sure what is failing for me in the first one. I can't decide if there is just too much difference in each section of the image, both color/contrast and subject lines. Either of the two types of dune features have appealed to me when presented independently. I think if the lighting difference between the two dune sections was less I would like it more. But I think that it just lacks a focus beyond the dramatic structural differences in the dunes.