Photos in San Angelo
Wow, do I ever hate that idea. San Angelo is a great, classic world with comic book ties. Nothing personal, but while your Photoshopped images are interesting to look at and a great experiment, they're definitely not right for San Angelo. I'm even worried about the idea of too much realistic art. I mean, if you get an Alex Ross, fine. But even for all his realism, he manages to keep a sense of the majesty and "otherness" of the comic book world. In general, superhero costumes put on real people in photos or photo-like art look awkward. Like it or not, there's a good reason why movies tend to "naturalize" comic character costumes; real people look ridiculous in them.
The whole point of San Angelo isn't to be a "real" or "living" world. It's to be a setting where superheroics seem plausible, an organic part of the milieu. It's to give superheroes a fun backdrop in which to exist, making it clear in the players' imaginations. "Living," yes. But "real"? Not a chance.
And, as someone pointed out earlier, mixing drastically different art styles in a publication is just asking for trouble. It's okay for a cross-genre piece (the 5th edition rules work well in that respect), but, especially for a setting book, you need to make sure the images "play well" together.