Walk Cycle

Throughout my blog posts I've talked a  great deal about walk cycles, but I've given little information about them. Walk cycles are crucial in animation, as they make up the majority of actions in any given shot, and according to Richard Williams, are "about the toughest things to do right" (102). There is a general formula that most walk cycles follow, but as Williams writes time and time again, "All walks are different...no two people in the world walk the same" (103).

This is the general formula for walk cycles. If you look closely you will see a set of curved lines around the head of the walk cycle, and that line is the golden rule. Almost every cycle follows those lines. According to Williams, the above image is a "normal" walk cycle, where the weight goes down just after the step and the weight goes up just after the passing position (108).
When I tried this method, I followed the example above. The positions are labeled, and I found William's method a very easy and simple one to use. What are some things I could add to make varying walk cycles?