Thank goodness for photoshop, it's like my backup set of eyeballs. As we learn color correcting tools like the Hue/Saturation box, Selective Colors, and Levels/Curves, it's crazy how much nicer my colors can look. I tried to make some gif animations to show the changes in a few (although they are a bit subtle).
Like my penguins looked a little red, but with selective colors I was able to get rid of it!
And these M&Ms were supposed to be gray, but the looked rather green.