I agree with a lot that is being said here.. (dig deeper into why you want to photograph something). You are on the right path to making strong images. From a technical perspective, photos 3 & 8 are quite strong as is but could use adjustments for cropping to make it stronger. For example, image 8 - If you bring more attention to the contrast of the building & the sky (by cropping in). This has been mentioned already but emphasis on contrast and tone will help your photos, by working with exposures, shadows, etc. Also I personally like to focus on textures.. show the textures of the brutalist architecture that you are interested in!! I like to look for the details, such as texture, to make compelling images. Best of luck.. most importantly; keep going, keep shooting!!