These are very interesting. Your technique seems to be similar to John R's, but the results have a very different mood. I like all of these, but the first seems especially fine.
For me the last one seems most effective as the colours seem strongest. This is not an easy technique and your shots seem good but maybe some suffer from too much bright cloud/sky?
Thank you very much for the comments.
Eric - Yes i have seen John R's work and find it interesting - personally I am wanting to retain more of the subject matter and be a little less 'abstract' than he ... but it is,of course, all a matter of taste. I agree with your choice - it is one that I feel is more successful than some.
drmike - i can see your point about the brightness but in a print it seems to distract less and even add to the complexity of the image - but a point to weigh for the future, thanks.
More generally i am not too sure what legs this little project has against my more usual 'tree fetish' images.