This is a male Brewster County Crotaphytus collaris, photo courtesy Joe Forks.
Close-up of the same lizard, photo used with  Joe Forks' permission.
This is a female Brewster County Crotaphytus collaris, photo courtesy Joe Forks.
Close-up of the same lizard, photo used with  Joe Forks' permission.
Here is a colorful male from the Wimberley area (central TX).  Photo by David Turner; used with permission.