While I was trying to mix oil paint colors, I realized that different color combinations make totally different shades and tones, even a slight different ratio of oil paint can make a huge difference.

I’m not a fine art student so I have to experience it myself. I feel the responsibility to mix very precise colors for realism painting, and I always thought that it shows the well-skilled and logic of an artist.
However, my assumption was finally destroyed when I've learned that color is just an expression of a personal taste, and sometimes there is no right or wrong color.
I hope this piece of information will give me more freedom in painting.