Thanks for the suggestions, guys. I actually did notice the lighter sky before, but decided to put the shots up anyhow. I've also been playing with different filters and settings, and I cannot darken the sky sufficiently no matter what I do. Looking at it now, it seems obvious why: the bright sky (filmed during daytime) is standing out against the dark silhouette of the tree. It was focused upon in the original version. What I'm probably going to have to do is crop those two particular shots, as nicely framed as they are already, so as to omit the sky. It kills me to do it, but it appears to be the only option.

And as for the dialogue about keeping the love secret, I'm trying to think of a way to incorporate it gracefully and in context with this scene. I just don't know if it can be done. Perhaps I could try and insert it into the scene after the nightmare, when Anakin and Padme talk the next morning.