A great idea to paint the walls to protect them from vandals. I hope that these vandals will not be tempted to destroy these paintings as well. Very talented those who drew, students. I know that there is a Polish tradition in such graphics, the famous posters from the 70s and 80s I think. I was a fan of Polish film and music from that period ... Wajda and Czesław Niemen, as far back as I can remember. There were of course more, I mean directors and actors ... I should try to remember.
It is nice to discover unknown places in your city.
Fortunately, this idea turned out to be successful. Murals have been around for a while and nobody has destroyed them :) It's nice that you liked Polish films of famous Polish directors. I also like those times, probably the most in terms of music. Music in the 80's and 90's and even the 70's was great. Sometimes I listen to old songs like that.
I am glad that this method gave good results. It should be expanded and used more often. I'm nostalgic for the 70's and 90's.