Here's the series of photos from the workshop. I continued working at home and finished the painting last week.
Step 1. (the picture is rotated from the final view): Draw the basic outline of a grape branch, pretty bulky towards the edge of the page. Using liquid latex, paint the back sides of grape leaves and stamp them down onto the paper pressing firmly. Build up clusters of large, medium, and small leaves. Use a frisket (Pebeo) to mask the main branch. Let dry for several hours.
Step 3. Remove the resist and paint the leaves.
Step 4. Paint the branches.
There are some interesting tips and tricks throughout the process, which I'm not including as they are probably Nancy's proprietary information. I highly recommend her workshop. She's also working on a book which may be out this next year. Check out her website which has several tutorial videos. www.nancycollinsart.com/