I guess I'm blind because I can't see any odd edges. Or my monitor is worse than I thought. But, I know what you're talking about. In the images that I've done with clouds like that, I've found that as long as the bounding boxes don't touch, I don't get strangeness. I've found that it's all a matter of perspective then. Some of my clouds in the Uncontrollable Forces challenge picture are very close, some are very far in reality but with sizing, they look like they're close together. I love what you've done this these clouds. I'm going to have to keep trying because I've not been able to get anything this good looking yet. Great work!