/ic/ - Artwork/Critique

So I'm working on this and I realized my perspective is realllllllllly off. This is for a figure drawing class- I plan on making the tops of the walls true horizontals and redoing the book. I believe when this is finished it will have 6 figures total. Will it be too much? I plan on moving the current middle figure back so that the current three figures are not in the same plane to hopefully add more depth- The floor ends by the large columns in the back ground and the images vanishing point will continue out in to some out doorsy backgrounds. I need to represent Multipoint perspective, single point perspective and Atmospheric perspective. I plan on also using this work as a light logic study. Is there anything I could do to help improve the composition?