Guess What I'm Working On?

The image above is a teaser of what I have been working on for my birthday on the 31st of December. New Year's Eve is a tough day to get people together for a birthday party so I have decided to do something a little different for my 50th birthday.

I have invited family and friends to stop by the Galerie du Pressoir on the 31st for a one day showing of my art work. I will be there from 10 AM until 8 PM putting the finishing touches on the drawing depicted above. Can you guess what it is?