Karl's landscape sketch comp is probably my favorite workshop each year. There's something about the changing seasons (spring and fall) and being out in nature painting with other people that's just relaxing and fun, even when the artwork isn't always cooperating. I try to push myself to focus on something new each time I go, and this year was composition and value. I did notice that I'm more comfortable and confident with my painting when I have an underdrawing then when I try to draw with paint.
My favorite piece was done on an MDF art panel (medium density fiberboard, which i definitely will be exploring more in my illustration work, since I like how it handles paint and I find I am more confident with a surface that won't easily tear and is not bright white.