How to make a sci-fiction book cover in photoshop

I’m finishing up a science fiction book cover for Cameron Mcvey’s “Nova Sol” – it’s fun to see how far it has come since the initial mockups. Based on the description (a moon crashing into earth/green planet, with lightning, maybe a person watching) I came up with these:

Cameron liked the 3rd one, so I reworked it into these, adding detail and text effects, and changing the man:

(I really love this one of the road, but maybe I’ll use it for something else).

The following will probably be the winner:

 

What do you think?