Do you have a picture in front of you or can you picture everything in your head, without needing a starting point? Is having a visual in front of you pretty much key? Do a lot of authors do this or do more authors just see it in their heads than have a picture in front of face? Also, in terms of specifically describing the scenery, do you often know most of the terminology you will need or do you use a dictionary (or visual reference with the names of trees/grass types/whatever) for finding the appropriate words? Thanks in advance.