One little nitpick: Luke looks like he is finished walking into position in the first shot, whereas the other three are standing firm.
I wonder if it might help just a little to mirror Anakin since he’s gazing to the right whereas Rey (and therefore sort of the ghosts) are established as being right of Palpatine.
The shot of Anakin is pretty static, perhaps the face aging could be done with a still or two using key frames. If so, I wonder what it’d be like to blend him with a young Sebastian Shaw (because there’ll be more footage to work with) and then aging that.
Easy for me to say, of course.