The software has changed since this group was started. I believe it automatically resizes your pics now -- max width 750 pixels? Look for the "width" option when you upload.
So I think we can forget the 200kB limit? You might want to keep them, say, smaller than 500 pixels wide for those of us with slower connections.
This was a 3.5 MB file. I uploaded it , and set the width to 250 pixels:
Here's the same 3.5 MB uploaded with the width set to 750 pixels (the max?):