PoseNet is not accurate and unstable whatever people pose

[Simon1059770342]

I am running PoseNet on PC and saw that whatever people pose, the model can't detect the legs of the person, does this is something that is happening only to me or is a general problem. If so is there any way I can improve the accuracy of PoseNet ?

Running on PC: Micro-Star (Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz 2.20 GHz)
-Also why its so unstable, I mean I stay in one place and points keep changing places

-Can it work better on black and white frames ?

-Should I have a dark background image?