Finally I've been able to go big! 30 x 40 canvases are now easy to manage with some basics from Jane Filer's approach toward underpainting. My new ventilation system makes an hour or two in front of a canvas safe for me. So I am off and running--and running up my paint bill.
Here is a stab at painting my old waterfall sketches in acrylic while taking advantage of the fun things that I do with my house paintings.