Wow, so many things already!
First of all great job! Your shading looks awesome! Let me try to give some feedback...
Nice room, i think you understand the concept very well! One thing i think you can do better is to give more attention to the size and thickness of the objects. it looks a little strange to me, but i'm not sure exactly what it is (maybe the door and chair thickness, the floor tile or the shading on the bed. You can also work on your lines a little, giving things that are closer to us thicker lines.
Good job! I think you could have spent a little more time in this though, working a little more on the windows and doors and the thickness of things... I don't know if you did this, but i think it's a good practice to make the straight lines free handly... i think you used the line tool by the fixed thickness of the lines.
Nice work again! The top of the head of the left one is a little too short and the ears could be sent a little more to the back. The ears in the right one look kinda small and the shading is making the forehead look too flat in both. I recommend that you take a look at the Asaro Head to understand the planes of the face better.
You're doing great, and so fast! It took me ages to get to those assignments, hehe.
Hope this helps! keep it up!