I hardly ever work on more than one piece at a time. Even when I do pieces that are part of a series, I may have the general idea of what I plan to do for each one, but that is about as far as it goes. They don't even get to my refined sketch, which is what comes before I get out the pastel paper. So it will be interesting for me to see how these two progress. I think one of the reasons I've avoided doing more than one at a time is that I'm afraid I may lose interest in one if I have something else to do. My head might be in a completely different place by the time I can get back to it and I'll scrap it and come up with something else.