Most of us complain that our models won't stay still, and you want yours to move!
My only suggestion would be to impart the illusion of imminent or necessary (or just-completed) motion through an element of dynamic tension in the pose. This might be a mid-step lifted foot with the body's weight moved to the opposite side, indicated by that reverse crescent posture we assume to accommodate that movement in the center of gravity. Or a long skirt lifted to avoid a pool of water in the path. Perhaps the figure's head is turned as if her attention has been caught by some sight or sound to the side, suggesting with a slight twist that her body is being drawn around in the same direction. Perhaps arms loosely extended from the sides, one poised in leading a body rotation, the other following, her head slightly raised to indicate attention directed at something above her (the sunlit trees, perhaps.) Or one hand raised to hold aside a branch that is impeding her way, as she slightly dips her body away from it.
As for hard and soft edges, I guess I'd say, soften the edges of the parts of the form that are in movement, rather than leave a forward portion of that form hard-edged and the back side soft. You wouldn't want it to look like the cartoon Roadrunner going from zero to sixty.
The only painting I have of a static pose that suggests tension or imminent motion happens to be of a dog, which doesn't qualify for posting here, but I'll email it to you.
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