First of all, congrats on your show! You've got to be proud of that, and you must feel an obligation to do your damn best. I hope it leads to many more, and motivates adventures for you and your buddies.
Taking liberties with one of your pix, I played with #1 in Photoshop Elements 11. I like the layout of this picture; but the bright square of sun in the foreground is distracting, and I can't see the gritty texture of the stairs and marble panels very well.
1. Original.
2. I cropped out most of the foreground floor. Just left enough to show that there's some kind of airy opening to the left.
3. In Expert Mode I used lighting levels and cut off the unused high end of the histogram. This gives more "bandwidth" for contrast.
4. So far...
5. I made it a little brighter and pulled down the contrast a bit.
6. So far...
7. In Guided mode I pulled sharpening out; this makes it gritty really fast so needs to be done with restraint.
8. My best effort:
What I can't fix without gross manipulation is lack of a focal object. Something lying on the stairs like those scary rag dolls that seem to hang around these places. Or maybe a naked woman smoking a joint. Of course that would be staging and not authentic. It's hard to be a journalist and an artist at the same time.