Thanks Fred and Shelley.
I accepted the noise in the first image - strangely, I really like it - each to his own...
The second, could be smoother in the foliage. I think I deliberately made it look plastic - overdone. I did use Pixinsight for another image and it was very smooth - I'll try that with the second image. The third is just jpeg noise. I'll find a way to post a better resolution.
I'm looking forward to improving on this. I love the effect, and agree that simpler and architectural images are very effective - still I'd like to find a way to use it with nature shots.