What works better. Dark foreground and well lit background or the other way around. Good to play with the exposure levels here.
Another difficult exposure situation. I really like the variety of color on the walls of the slide. I might try to crop out the dark area around the tunnel. You can also do this in Photoshop after the fact.
I really like the cool blue color in this image. I don't know if it would be possible, but I would love to see more of the sign which would mean raising the photographer's perspective. Also, the Class of 2016 could be in better focus which you get by stopping the aperture down as much as possible.