Interior 2 points perspective. Yusra

Hi Matt, 

I did this exercise on cheap printing paper. I found difficulties shading the 2 black chairs , so I started shading with 8b pencil then I added sharcoal pencil so it gets muddy and if you can show me how to show the light coming out of the door I couldn’t express it well.Also if you can show me how can I resolve the shading in this composition I will appreciate that. Lots of thanks and God Bless You.