Detail of Rock Lake Road

I'm very excited about negative painting these days...so here is an example: I painted the shape of the sky around the trees on the ridge...the trees are simply the underpainting (which was dry and done first). There is not doubt in my mind that it forces me to paint different shapes, more animated, perhaps more abstact, and certainly with more personality...and is very challenging. The best approach I find is to just DO IT! Don't think about it, just follow the brush, and lots of practice helps. Anyone else out there using this approach with oils...?