Would it be better if I were to replace the rocks behind Luke and have him fade in totally independent of the surroundings?
I don’t mind Luke fading in, as it is a dream sequence, after all. However, I would maybe see if you could have him fade in more slowly, almost with the bright white bloom effect of the background.
I kind of like the idea of the viewer seeing this and wondering if he faded in, or if it’s just almost like he’s appearing from the fog of the background. Maybe if his fade in was slower and not so obviously an appearance. Think more of a gradual reveal — “is that a figure? a person? it is a person! omg, is that Luke?”
In its current state, it’s more like he just apparated into the frame. Having his appearance come in a little slower may make it seem more mysterious. I don’t think you have to replace the rocks necessarily.