In the journal with graphite first then shiva.
I really like the oil sticks the best of all the mediums to paint a face. I drew the face with graphite pencil first, then colored pencils to get some color down then add shiva oil sticks. I drew her in the composition notebook and pasted her into one of my larger journals over a watercolor wash. Then added stamps and punchanella. I love shive oil sticks. They are creamy and dreamy!!! It may just become my medium of choice for faces. You can also paint the face with acrylics then add shiva as a final coat to smooth everything out as long as the acrylic is dry.
Also, I have signed up for another faces class by Sharon Tomlinson of All Norah's Art! I have actually been waiting for her to do a class ever since I found her blog some time ago. I don't buy clothes or go to the malls anymore--I buy art classes! I get paint all over my clothes anyway---:)
Have a great weekend!