Animating a sequence of still frames
The key thing is controlled lighting, and a camera positioned so that it never moves (locked off on a tripod).  It really helps to use a plain background - a solid colour is good.
Beyond that, you could assemble the images in After Effects, or as an Image Sequence in QuickTime Player, Screenflow, or many other packages.
After Effects is useful for things like this as you could overlap the images and make them semi-opaque, to see whether you need to tweak their positions very slightly.
If the lighting matches on each shot and the camera is in the same position, and the model stands at the same point each time, you may not need to morph the shots, but if you do, the built-in Liquify plugin can help with this.