If you use a prop to display your work on and it slides off or can not keep its position, I use clear Plasti Dip by Performix to put a thick gripable coat on it, your work will stay where you put it.
You can also purchase some clear "museum wax" which is a sticky gel designed to keep things from bouncing around in earthquakes. It only takes a very tiny pinch to hold the pen and it will last for many many uses.