I love it overall. I'm a sucker for desert scenes, and this fits the bill admirably. As far as originality is concerned, it's hard to make such a seemingly simple scene look "original" because "solitary guy on outcropping in desert" has probably been done a hundred times before. However, the strong shadows that really seem to anchor the picture to the bottom, and the bold sweep of rock, I feel, make for quite an original composition.
Colours are great. The red obviously contrasts nicely with the blue sky (nice choice of blue, by the way), and the tones are very effective too in drawing the eye to the figure.
The only criticisms I have are: a) I think a little more space at the top would be good as to me the figure looks slightly hemmed-in by the top edge. Others may not have this same problem though; I think it's probably something that would depend on the viewer; and b) I find the signature in the bottom-right a little distracting (but talk about nit-picking!).
Lovely work with great contrasts between sun and shadow, and the concentration of colour to the top really helps make the figure pop.