I wish I had said something sooner about this, but I didn’t. The RGB color wheel that digital painting softwares use is not the traditional RYB color wheel. The RGB color wheel differs by a few degrees, so the complementary colors in the RGB color wheel is not correct. I.E., the complementary color of green IS NOT PINK, it is RED, like Christmas colors. The example is wrong. The reason the RGB color wheel is off by a few degrees is because it accounts for CYAN, which traditional color wheel does not.
The good news is that a few of the submitted entries use hues very close enough to the real complementary colors that it works. I see people thinking that yellow is the complement of blue when it’s actually orange… but some of the submitted entries use orange in their yellows that it works.
For the traditional complementary colors that are historically more appealing, here is a guide;
I hope I mentioned this early enough so that people who had submitted entries already can correct their submission… or we can just go with the option of not being nitpicky and accept entries that use either the RGB color wheel or the traditional RYB color wheel… Either way I want people to know this so in the future they can compose their colors more accurately.