Now I like it! Pushing through the trees all the way to the sky brought back depth that had been taken away by darkening the forest so much. Also, as was brought up in previous comments, the strong verticle lines of the trees is a great compositional tool to be used with care. I'm happy with the color change from the first version (too much green). It's more lively and unexpected. Anyway, I'm going to try to put this painting away and leave it alone, although I admit I've become a bit addicted to changing it now. It's like eating potato chips (which I never eat) where you just keep seeing one more tempting little bit and, before you know it, you're 50 pounds heavier.
Thanks for all the helpful comments and suggestions!