It would have been lovely to get a full color version of the manga. It is a shame though that this one stopped after the first arc. Which is a shame as there are alot of characters in the manga that I would love to see what they looked like in full color as some we have no idea what they look like and unless Crystal/Eternal shows what they look like we may never see them.
For instance if we do get movies based on the Stars arc I think we will definitely finally get to see what Guardian Cosmos looks like in full color and maybe Sailor Chaos and Sailor Coronis though I could see them leaving out those two. I have said before that I would love it if they gave Sailor Chaos the color scheme of Chaos Galaxia from the 90s anime because I think the black outfit with the red hair, the yellow eyes and the pale skin honestly would look perfect for her and screams evil and Sailor Cosmos's opposite etc.
Honestly unless we are very lucky and they include them in some specials or something we will probably never see what certain manga exclusive characters look like, like Lilica Hubert's Mother from the first Chibiusa's Picture Diary, Shokujo, Kengyu, Zeta and Epsilon from the second Picture Diary, Touhi Chan from the Makoto's Melancholy Exam Battle or Ghost Cistern from the Rei and Minako's Girl School Days Exam Battle. Likewise we probably won't see what Resin looks like from the 4th Chibiusa's Picture Diary or Otakura from the 5th Chibiusa's picture Diary and we won't get to see what the Parallel Sailor Senshi's Sailor Outfits look like in full color either and we most certainly won't see what many of the Codename Sailor V villains look like in color. The only ones we even have colored images of are Phantom Ace/Danburite and Pandora to my knowledge.