i work big from the start. in digital, you really can't get a good image if you need to blow it up too much as there just isn't any data to work with. you can always go smaller. consequently, a complex image will take several 'versions' with various layers exploded... as each section or 'piece' gets finished, it is compressed onto a single layer and the next section gets worked on. one of the real PIA of working for 'hard copy' output. but, ultimately worth it i think.