20 tiles wide. No duplicates, although there are several pictures in there that are similar to each other. I like how the butterfly turned out--it utilises a lot of dynamic photos--but the background, to me, leaves something to be desired, mostly a bigger variety of more interesting pictures. I have nothing against uniform and "spacious" photographs, they can be beautiful, but when they show up exclusively, next to each other, for large blocks of a mosaic they can get boring.
I will definitely redo this once I can enlarge my collection again.
I created this with Andreamosaic, an EXCELLENT photo mosaic making programme {IMO the best} that, best of all, is free.