Straights versus Curves

If we want interesting and appealing characters to look at we should use straight against curved lines.

For what I've seen in most Disney movies (and other art master pieces of course) the trick is not only to randomly put a straight line against a curve, but how it is done.

Here the rule of thirds comes really handy: usually we better perceive an image when the focal point is shifted from the center, so we put the most important element in a scene shifted to the right (or left, or up/down).
The same principle is applied to our straights and curves:

Here you can see that if we put the apex of our curve not in the middle but in the first (or last) third the curve has a better appeal to us.

Also avoiding symmetry in our lines makes them more "natural" our drawings (in nature we rarely see things perfectly symmetrical: think about the branches of a tree or the grass).

Here are some frames I've taken randomly from some Disney movies:

I tried the same thing with a painting by Michelangelo, and guess what?