To me the lack of creativity in the planet design is one of the most disappointing aspects of this trilogy:
https://i.redd.it/i5akpa77g6v41.png
Takodana, Jakku and Passana are probably high up on the priority list for an overhaul.
I think Jakku needs to closely resemble it’s concept art, with as many fallen Starships in the background as possible
https://cdnb.artstation.com/p/assets/images/images/009/718/717/large/esbjorn-nord-swbfii-esbjornnord-16.jpg?1520504892
https://pbs.twimg.com/media/EAKy6drXUAAyVWn.jpg
https://pm1.narvii.com/6035/8beb9d145bff03997f9841d75e210dcb159b338a_hq.jpg
Takodana’s medieval aesthetic could be eccentuated by adding more castles in the distance, perhaps even adding a few pirate ships on the lake as well.
Passana, which in my opinion is the worst offender, could be turned into an ancient sith world, a parallel to jedda, the sand could be turned to more of a reddish tone , with altered establishing shots from Rogue One of statues and temples of the Sith, I think it would only be appropriate since after all it’s where we find out about the Sith dagger and Sith loyalists.
Although I like the look of the Achto island, I think it needs more of that Star wars “out of this world” feel. Apparently JJ had the idea of surrounding the island with floating rocks, something akin to Rey’s stunt on Crait. I think it would be a neat addition aestheticly as well as in the context of the story. Imagine seeing a planet so powerful in the force yet only to find out that the one who lives on it has blocked himself completely from the force.