GPU Pro 4, My first finished scene

Hi, this should be my first post on a finished image. I was trying to create a model of this book GPU Pro 4, which is beautiful but also challenging to read. I tried to strive for realism but something is still off. There isn't the red margins on the covers. Size is approximate but not precise. I spent hours tweaking the UV mapping stuff. Textures just went crooked when I tried to put them on slightly curved faces :( Anyway, I only got 125 hours. I would love some feedback on modeling, material or texturing. I didn't focus on setting up the scene.