NeverarGreat said:
As for the change, yes the SE version is prettier. And normally I would say that the prettier shot would be better, but this is Tatooine, and it's not supposed to be nice or magical in most shots. The sky isn't supposed to be bright blue, it's supposed to be rather washed out. Tatooine is intentionally below everyone's standards, including and especially Luke's.
Well this "supposed to" is entirely your assumption. Tatooine is indeed meant to be harsh environment. But harsh does not equal ugly. A lot of desert environments offer some of the most beautiful scenery on Earth. In fact I would argue that in all other episodes Tatooine shots are nice. And arguing that sky in a desert should not be bright blue is very unreasonable.
The reason why half of the Tatooine shots (i.e. from Tunisia) in ANH look unappealing, in my opinion, comes down to two factors. First, they were really unlucky with the weather conditions. Second, they had severe budget limitations.