The mule deer model is great, and the cactus is fine, but I think you could stand to lose at least half of the bushes, particularly in the foreground, and the other half would benefit from some kind of colour adjustment, as there is something about that light green that really clashes with the underlying landscape colour. Also, having looked at a few pictures of the Sonoran desert online, the sand colour would benefit from added grey.
Hope this helps, and hope to see the final version in the gallery.
P.S. - the image itself can be a lot wider and taller, as long as you're prepared to decrease the quality of the JPEG a bit.