Prolly some or most have already been said, if so sorry for the repetition. Here are some things i would like to suggest.
- the ability to choose wich photos we take outside the studio (poses) like we choose when in the studio, instead of the current random way. the more we progress in the story the more options it will give us, seeing we have 5 hearts in anna relationship having at least 6 different photos per zone (kitchen,park,pool,etc) out of the studio would give a good amount of content and goals for the players. it could be even more if the romance/slut rotes affect those photos.
- more colabs. currently we can do colab with chloe but its the mc, but it would be fun if we could take photos with chloe and anna for anna's starmaker, and not just end there, we could invite other women to the studio to do some photoshots with anna, some like chloe would have no problems others could be tied to certain factors, like advancing their story or getting some special clothes in case they dont want to be recognized, like cosplay stuff, lace masks, etc.
- more stuff to buy and spend the money you earn, in case you dont want to pay the dad's debt or you just have a ton of money. Like more clothes, more toys and acessories, real estate for example. the last one you could even tie to the story, like you need to have your own house to get some of the endings, or even having an external photo studio to do more and unique photoshots, the "city studio" could even be one of the requirements and the only place to do colabs with other girls. the "city studio" could also be the final goal of doing the photo lessons and the photo lessons could be expanded due to that. also some new chars that might be introduced could only show up after buying x or y real estate.
- there is sharing content, futa content, trap/femboy content, why not go full preggo content too, seeing it was already semi introduced with isabella. im not saying the mc could get every single woman pregnant, but at least anna, charlotte and samantha could be knocked up too and have ingame models of them like that with some unique scenes and maybe even photoshoots for starmaker.
- romance/corruption/friendship route for more characters. anna already have both routes it would be nice for more characters to have those branching choices. a small example, river, lets say you're not a fan of trap content, instead of just having the scenes already implemented there could also be a secondary route were you remain just his friend, help him out making is own fantasy story and maybe could even be invited to the studio.
- photoshots during starcon to add to starmaker, to take advantage of those unique costumes, plus more costumes for starcon and maybe some goalpost, like unless you have x subscribers you cant access certain costumes.
- this last one will be trickier to do and prolly less likelly. extra starmakers accounts for the mc to manage, either one or two characters (like samantha and charlotte, these seem the more obvious ones) or one account of the mc, where wouldnt be focused on anna only content but the only place where you could post photoshoots you did with or without anna in the above suggested "city studio".