The photos look fine. If your useing a standard 35mm camera that has manual setting (f stops), take a series of photos with one above and one below what the meter says. With automatic systems try to center the area with a medium lighting, not the darkest or the lightest. And above all when you take the film in to process it tell the people there that they are night photos with out a flash. Auto print machines have a problem with extreme situations with things being to bright or to dark. They like normal daylight stuff and try to print everything that way. If there is an operator there, tell them what you have and they might be able to help you get the photos you want. Try 400 speed film without a flash, make notes of what you did and do a experimental run through be for you do the real important photos.