It is always nice, at least in my opinion to see the glow around cacti when the sun strikes the spines just right. The cactus in the foreground is a Cholla Cactus, which is one of the best, if not the best, in my area for catching that light. I stopped down my aperture to f20 to get the star effect and waited for the sun to get positioned just right for this image. I bumped us the warm tones with white balance in Lightroom. I also used Topaz Clarity to increase contrast and Topaz Detail to bring out a little bit more details. I also did a little some dodging and burning in Photoshop to lighten highlights and darken the shadows some.
35mm, f20, 1/50 sec, ISO 100.
You may see a larger version of this image here in Flickr.