The lesson I learned here is, don't put a green tractor in a green landscape. I painted this to learn how to put a landscape background around larger center of interest. I think this would have worked if it had been a fall scene. Someday I just might do that to see the comparison.
I've got a long way to go on trees. I've watched the William Powell DVD, "How to Paint Trees" a couple of times. He gives some good advice and I highly recommend any of his DVDs . You can get it at http://www.williampowell-artist.com/ His best advice, "Practice, Practice, Practice"