If a full-course workshop does not suit your goal(s), then consider what it is that you would like to learn from me, with "A La Carte Sessions" and I will oblige, if I can.   Contact me with the topic you would like to learn more about.
 
Here are some ideas:
Fluid Double Reverse 
Choosing images to render
Modifying images
Techniques and tips used to depict realism
Glass selections and cutting
Positioning pieces
Layering
Framing
Other