oh, and i just want to say this.  someone mentioned in the other thread that this is an arbitrary and artificial way to get comments.  for me it's not.  i would rather have detailed critiques, and i would rather give them.  i find myself taking much longer to write two or three purely positive lines that are also meaningful.  i just don't do, "love it!  it's perfect!" in general.  it's not me.  but a lot of people don't want thorough critiques, and for various highly respectable reasons.  this group identifies matches me up with the kind of people i want to comment on, and who i want comments from.  otherwise, i won't comment much.  asking for thorough critiques is the natural way to get me to comment, not doing enticing thumbnails or posting technically perfect work.