Not too shabby if these were all taken with a cellphone. Some are a bit shaky and out of focus but some are nice and very sharp. I can see that you were not just standing there taking pics - you changed your vertical position several times to try and enhance several photos to create a scene and a mood.
Every photographer looks for different aspects when critiquing someone else's photos and I'm the same. But sometimes we end up in a location where we might need to move quickly (ie: avoiding the cops arriving, security, etc.) and there isn't always the opportunity to have a nicely set up tripod, diffused lighting, and light meters to help with that perfect shot.
Considering the above and that these were taken on a cellphone I think that you did alright.
My favs are #4, #13, #14, and #18 (if had been more in focus it would have been a great shot - can't imagine being tied up to that although I did work in an institution for almost 25 yrs).
You're getting your angles and that's an awesome start: most just stand and click. Composition and lighting are next - but you'll have a hard time of it with a cellphone.