Jonh other suggestions/comments for your consideration:

In the close ups of each of the force ghosts, it seems they each get the same sequence of lightning flashes. I would try to make the lightning flashes seem more random in the close ups. Varying the length of each close up might also help.
Just before Rey goes to kill Palpatine, if you decide to show even more force ghosts in the distance, a female Jedi would be good to add if possible and Mace Windu would be cool.
You chose the perfect characters to appear behind Rey. Nice job. And Obi-Wan looks tough!