Wendy, these are fabulous! I especially love the red path through the trees. Yes, it is astonishing that these are your first recent plein-air works; I wouldn't have thought you could do such good landscapes from photos without a lot of plein-air experience.
As you know from the sketches thread in the pastels forum, I've embarked on plein-air work myself during the last month or two, and I've been loving it but also struggling with it. Maybe, since you've been brave enough to post here, I'll put mine up too and get some feedback from the experts.
To Kittengale - I work outdoors with chalk pastels and the dust doesn't exactly drift away on the wind. You have to blow on it (no-no-no-no-no!
or give your board a good tap. It does then disappear nicely into the weeds. Easier than at home, where it's only going to go somewhere you'll have to dust later. Make sure you bring moist towelletes to clean your hands and don't forget your face - like I did, walking back through town looking like a coal miner. (You may not have that problem, but I'm the world's messiest painter.)