There
is another photo on this site, "Grand Canyon Sunset" taken from
this same spot. The difference is a slightly longer lens and mainly, that
the sun was still above the horizon in the other photo. Don't be afraid to
take photos after the sun has set, just be sure to have a tripod or some way
to steady your camera for the longer exposures. Here is a link to the other
photo if you want to compare: Grand
Canyon Sunset