Please look carefully to Katanaz Stock frontpage on the DeviantArt profile and you'll see their rules. As they have so many requests, they do not have time to give permission to each and everyone if they use their stock outside DA. As result, they allow everybody to use their stock outside DA as long as they get credit. They have been also informed about my image...as a result, I guess I've respected all the conditions to participate to the "Leaf contest". Thx!