Hey @mmatias.mail!
We've got a similar backstory when it comes to art - I took a 6 year long art break in my 20s and have decided to really get back into it in 2020. Your artwork (pre-art school I mean) is very promising and your foundations are solid enough that you stand to gain the most from the Art School program.
As for your homework, it's fantastic! Your gesture drawings and perspective pieces are just sizzling with potential, and you rarely see that level of care put into them. I love your line quality and attention to cast shadows.
Keep doing (and sharing) the assignments, as you'll never stop learning things and they are one of the more valuable aspects of Art School. Once you get past the first few assignments, make up your own homework and keep striving for quality pieces like these ones.
Finally, to answer your question about scale, 1 point perspective is sort of flat-looking for any polished artwork and it's difficult to convey scale. However, as long as things are in proportions relative to each other, you can transform/stretch the image in any axis while maintaining the same "correct" perspective because the vanishing point remains unaffected.
Your bedroom picture could easily be stretched vertically by 20%, I tried it and it felt a touch better to me. Also (and I know this is outside of the scope of the homework), you can give it a spherical distortion and it looks SUPER COOL.
Anyway, I'm done ranting. I just wanna reiterate that I love your work so far. Keep it coming 
