My personal favorite perspective book to read is ernest norling’s perspective made easy. In my opinion, Most books make it way too complicated, almost like trying to turn an artist into a calculating computer program. I think the best perspective practice might just be drawing rotating primitive forms - cylinder, box, prism, pyramid, cone, ribbons, as well as learning ellipses made when a circle is seen at an angle. As to fun and right amount practice, maybe a good approach is doing a small amount that can be a daily habit, as i expect that persistence will pay off way more than a few arduous marathon study sessions followed by burnout.

Nice work, It takes a lot of motivation to tackle perspective. Be careful about the edges of your boxes, they all need to be parallel and converge to the same vanishing points. Otherwise the angles of your boxes won't align with each other and the overall structure will fall apart. As for practice time, perspective is the most important fundamental in drawing, so i'd say try to dedicate as much time as possible to it, until you get comfortable with drawing boxes from any angle. The fun begins once you get the basics down. At least that's how i see it. Hope this helped. Keep going.

I do a lot of practice too. The doing is fun, the learning is fun. The part that isn't fun is not having many finished works. Id rather get good at the basics then put out a lot of finish pieces that aren't that great. That's the reality of learning on your own and in whatever available time one has. I do not have much time these days. Do what you can, when you can. There is no finish line in the big picture, the finish line being some kind of completed artist, you decided when that is. What we can do is stick to making some small goals for and complete those. I mean do whatever works for you. there may be one mountain but there are hundreds of thousands of paths. If you want to just have fun doing art, without the practice then do that, there's nothing that says that you have to only practice and get perfect at some aspect of art in order to be worthy of doing art. You do you! :) I like these boxes in perspective you've done. It seems like you're getting the basic idea. Good for you. A while back, when I first learned about perspective and vanishing points It blew my mind. I got all the information about it I could, mostly from books. I drew and drew and drew. For me when I was first introduced to 1point 2 point 3 point perspective, I thought the accuracy of creating 3d objects on a 2d surface was baffling and so cool. Learning is fun!!! There's a lot to it, and that's a good thing because when you know how to use perspective it opens up a wide range of applications. Unfortunately there's not much I can say about learning it, I mean Once you got the basics down where you take it, well that's up to you. And just from your images Id say you have the basics down. What kind of exercises? For a beginner there are loads of them. Here on Proko.com you have resources, or youtube, books.....its hard not to find exercises on this topic Seriously learning to draw in perspective is a blast. Just wait till you get to atmospheric perspective. Wowwie