Photo-puppet enhancement?

Hi Y’all, I’ve been (belatedly) progressing with TBS and can now make, rig, and manipulate photo-puppets reasonably well. However, during the photo shoot I had my talent pose as if walking i.e. alternatively lifting left and right feet, - essentially making my own keyframes which I hoped would come in handy for lending realism to any walk sequence. Now I’m wondering how best to incorporate these shots into my scene? Thanx in advance