Wall of Mailboxes Final

Hi Lads, And so, I just finished "Creating a Wall of Mailboxes" tutorial. I realy enjoyd the course found very cool modeling and texturing technics wich I'm using. However shading technics was realy overwhelming. So, I decided to creat my own shaders based on logic which I understand better. My goal was to understand shading node editor also learn new modeling technics as well. I know that image looks a bit too clean, no dust and scraches and etc. but I think I'm on good way to push foward next time :) I would appreciated if somebody would give me criticism. Thanks a lot. :)