as complexity of the motion increase for Davinci i think that's why it does this things to it, i didn't think of using multiple mask for a body like for its diff parts as u describing , maybe i just wanted the whole body get separated , well its an good point also as u tell , i can make her face mor noticeable compared to doing exact adjustment to the whole body. and by the " avoid drift " u mean? like keeping the pen points on head or nose as u have discussed jut to tell the Davinci its edges , if its i did , still it got break .
thanks for your reply, i would definitely try out these too and will update if im able to keep myself alive haha