Every time we use a textured import like a 3ds or poser object, isn't that an object that someone else comitted work on prior to the month's challenge? Not only are you asking to use an import, which has already been allowed for the challenge, you're using your own import. If it were a case where you had three elephants around a tree in a post two months ago and you posted the exact same image or maybe just moved the camera a bit it would be an issue. The challenge for this month is supposed to be a nature scene and depend heavily on the one new tree you do. If your tree looks great I don't see when or how the other objects in the scene were created matter.