Bedroom Shading

I traced out the leader's design of the bedroom with a thicker, more dense brush. And then performed the block shading:

Here is the original:

Here is my shaded version:

However, when I had a closer look at the leader's drawing, there were actually a tone of flaws concerning the perspective of the drawing. All the objects in the room were all following different points of perspective. I have begun to try and correct this: