About the proportions, do you mean to do a light, rough outline of the shapes and then work in from there?
Yes. While it can be an interesting exercise to just start drawing at the most detailed level, it is generally best to block out your picture first by drawing the general outlines...this way you can adjust the outlines until you have proportions correct. In this picture, the head is much too large, and the couch ends are too skinny, and the body is a bit oddly shaped also.
I didn't do the shadows until the end, I tried to make them more pronounced but I didn't do it well enough.
Our eyes don't see shapes, they see light and shadows. Light is bright...so when we draw or paint, we are really only painting the negative light -- the shadows, because whatever medium we're using it's darker than pure white light.
So instead of drawing the shape outlines and then shadowing them, try just drawing the shadows from the start...and skip the outlines..because there is really nothing else to draw!
Now, the problem with your shadows is that they are not consistent...which indicates 2 problems.
1) The scene is not believable
2) It shows you're not drawing light as you see it
You're interpolating where you think there should be shadow...which is ok to do when you get good enough to do it realistically...but you're not there yet. Once you have practiced copying it, perhaps you'll get better and be able to fake it.
I have done a quick paint over to show you an example of a consistent set of shadows. This is more of a lamp-lit scene, I imagine that in your setting light was coming from more sources, but this is just an example.
By the way, when you do start doing your own lighting...your scenes will always look dark if you assume there is only 1 light source. In real life, there are light sources all over the place...because most objects reflect light, and you've got to take tha into consideration unless you want a night scene.
What gave it away that I didn't block in the overall picture? Just bad proportions?
By the way, thanks for commenting, I was waiting for someone to give me some advice. Do you see how much I have improved though? I don't know if you remember my first drawing I posted, it was terrible
No problem. I do notice that you have put more of a conscious effort into shading, which is good. However, the proportions and the composition might be worse.