Dogs Playing Mahjong - A Work in Progress

I have been working on a new art work recently.  This time, it's a graphite drawing on an 18" X 24" paper.  I am drawing four dogs playing mahjong.  Here is a picture of my drawing in progress:

It's almost done, but I need to work on it a little bit more.  Hopefully, I'll be able to finish it next week end, most probably on Sunday.

It's Sunday night right now.  I have been working on it the whole afternoon.  It's about time to stop and take a rest.  Tomorrow, I will be working in the office as an engineer as usual, and will not be touching this drawing until next week end.