Re: These covers--I like the conceit; to me the trees on dagobah are too similar visually to the Endor trees, so I don't love that. The other thing is that the foreground creature in both SW and Jedi are "aliens" so it's weird to have one of our "heroes" in the foreground on Empire. And finally I hate that ROTJ title treatment, which was invented for the SE releases. :) That's just personal preference. I sort of feel like the credits blocks are a bit weird too and could use some text spacing or something.
I think they're executed very nicely from what I can tell. Good detail on the landscape on tatooine and the speederbike looks great.