The more I draw people's faces, the more I realize how the slightest change in a small curve can radically change the look. As I improve the curve on an eye lid, I can see the face pop into focus. If I draw the curve on a jawline incorrectly, the face no longer resembles the person I'm trying to draw. It's amazing how each little curve makes up who you are.
It's also amazing that there are no straight lines on the human body. Try to find one. (If you do, let me know.) Hair comes pretty close. We grow up trying to learn how to draw straight lines. But they are not very useful when drawing nature.
There are also no straight lines in life. We can organize and strategize and plan all we want, but you know it's not going to turn out exactly how you envisioned it. The curves are what make your life your life. My day has already not gone as I expected. I had success yesterday with the "Dot Top" and then started on a blush tank which may not work out as well. We'll see tomorrow when I finish it. But that's life, isn't it?