Most originals left are on canvas. The few left that are under glass are either from the period 1987 - 2001, and they are painted with gouache.
OR they are from my time in Wisconsin, 2002 - 2011, and they are painted with acrylics on paper. Most works created in Texas, 2012 - 2018, were painted on paper using acrylics. The time in Mexico is a different thing altogether, as here I have only sold two originals during seven years. As a comparison, while I lived in Wisconsin and Texas, I sold about 30 originals at each location. In Mexico, I have sold NADA.
If you want to see what originals are still available, please go to pixels.com and look for COLLECTIONS