Thank you for keeping it. Slightly improved your current best using optimage: 1_pingo.png - 8484 --> 8454 2_pingo.png - 18540 --> 18483 4_zopfli.png - 91

Thank you for keeping it. Slightly improved your current best using optimage: 1_pingo.png - 8484 --> 8454 2_pingo.png - 18540 --> 18483 4_zopfli.png - 91846 --> 91838 https://imgur.com/a/opWft https://imgur.com/a/opWft