Communities aren't optimized to function as personal archives for writing, graphics, etc., and personal journals cannot have "child" personal journals. I suggest implementing a third username option that is optimized for archiving a single user (or a limited number of users') work in a way that sets them apart from mass-user communities. After all, an archive or art blog really isn't a community; it's a little misleading. Some features of communities are good for personal archives, as are some features of personal journals. It's a matter of finding a balance, but creating this option would be something that would definitely make me a firm DW convert.