Is a good idea to use Ebsynth to make the keyframes interpolation?

Hello to everyone.

I tried to use ebsynth in a different way,but it didn’t work. This is what I did : I’ve extracted the most important frames of a scene taken from an old movie. These frames are able to capture every detail belonging to the actor shown on the scene. As soon as I have extracted these frames,I have super imposed a 3d character over the original one. Below you can see how look the original keyframes :

https://drive.google.com/open?id=1ZD6bKpGuSz9GNXvsQi09rOB9gH-L6Plr 1

Below you can see how look the original most important keyframes :

https://drive.google.com/open?id=1ipOrRmIKwQz_cUidQol_isirrFfpScU0 1

Below you can see how look the most important / posed keyframes :

https://drive.google.com/open?id=197cnVodyTS-MZzzwp6Vq98sGd3PDcRbe 1

Below you can see how look the keyframes rendered with EbSynth :

https://drive.google.com/open?id=1RFqwaqM_roKdEGFmGhpPNA32JiQW7Qb7

I would like to know the reasons why the rendered pictures are deformed in a wrong way. How can I fix that ? And the most important thing that I want to know is : if this experiment worked,do u think that a good method ? I mean,is there a gain letting that ebsynth do the keyframes interpolation instead of letting that blender do that ? what’s the faster way to make the frames interpolation ? with ebsynth or directly in blender,adding the main poses inside the keyframe timeline ? thanks.