What stands out to me is the periscope and porthole like vents which remind me of a submarine. The theme of a sub in a solid object is interesting to me.
You didn’t describe your vision, so these thoughts aren’t pointers per se.
I don’t know if it is the paint or if it is really like this in person, but the contents in the frame appear putty, illustration or CGI like. Could easily pass as textured/moulded concrete or wallpaper. While I don’t like the gritty urban look, it could use something else such as light and shadow to make it more grounded.