Google has a cached copy of every picture they crawl from the web. Google will remove your pictures in 2-3 weeks once Google finds that the image link is not found or has expired.
During your first run, you want your worms to cocoon quickly, turn to moths lay eggs and die. You second batch is the one you want to allow to grow....
Coloring them with a Sharpie pen won't hurt their functionality on the game portal, so they should still work with the games just fine. As for cleaning off Sharpie, try...
