When I am prompted to 'try again' with a new 3x3 of low-res images I often wonder if there was a bit of 'crosswalk' I missed in one, or if this is just how they get me to annotate another set for 'bicycles' for free.
When they decide I'm a bot and just give me the low res stuff I give up accessing the website.
Well, we have been training them to do this for a while...