Hiya Elder, you've got some pretty good rendering skills going for you. One thing that bothers me in all of these though is how sharp everything is, it makes it seem like everything is important in them. Take the first piece for instance, no matter how far away objects are in the background all the edges are super sharp. I can see each and every door(?) clearly, nothing is suggested, every detail that will fit is visible. This isn't how our eyes work(though it is how a camera usually works), we can usually only focus on what we're looking at directly, with details becoming less and less perceivable as they move farther away from our focus. This type of focus can make for a powerful tool in illustration to help guide the viewers eyes exactly where you want them to be, as well as make your pieces feel more natural. I hope that helps :).