The rounded square is a metaball-plane!
But I drew Wall E and modeled him very primitively. I'm planning on making a better model in the future.
Room Exercise Progress
While doing the low poly room exercise I just couldn't stop adding more pretty useless details. It is true to scale as well. For example the second picture shows a part of the window that you can barely see in the first picture. Since I'm not very fast yet it would take some time until i finish the exercise. I think I will add some lower poly models, submit it and continue the learning flow first but I'm not sure because I would enjoy continuing as well. 
but I'm not sure because I would enjoy continuing as well
I'd vote continue! You'll learn a lot by doing so, and you'll get faster by practicing. There's no rush on submitting the exercise, so I think it would be just as effective for your learning (if not more so) to just keep at it and have fun 'till you're satisfied with the result.
In the last 3 weeks or so... I was quite lazy. But In the last few days I got productive again and I added some new furniture and some lower poly decorations. Also I played around with cloth simulations for the bed sheet and after a lot of experimenting and a bit of sculpting I think I like the result. I also downloaded a free wood texture and changed it up for the different furniture with different nodes so it looks like different wood and not like plastic anymore. It was quite fun. I think I have the 30 objects that are needed so I will submit it now and I'm looking forward to skulpting. One day I will continue on modeling my room.
My first skulpt. I really like the eyes. The mouth is a bit too small though. I couldn't make a splitted fin like in the art look right. I made the other fins that can be barely seen in the art a bit streched because i thought it would fit the style and I tried to imitate the bumps of a real hammerhead on the side.
