The "first pass" is nearly done. The idea behind doing a grisaille is that you establish the values (light and dark tones) before adding the color. That way you correct all the mistakes early on. It's a time consuming process, but I'm seeing the benefits of it. After this pass dries, I'll go over it again and make some adjustments, but first, I have to complete the two areas where there are stacks of wine glasses, and get someone to pose his hand in the correct position for the seated man; his hand is just a blur in the reference photo.
The Happy Hour, work in progress, (click on image for larger view)