Sorry for actually writing the walls of text but wanted to share a bit of experience from my perspective of a person who engaged and supported fair few games over a decade.
I absolutely get it. Basically I am using these as placeholder images so I can actually make the game since I have 0 artistic skill. Like I can't even draw a straight line.
The plan is focus on the voices, story and learning Renpy. If people really like the game then I will pay an actual artist to remake all the scenes and also add animation. But at least this way I can flesh out the story and hopefully make a good game.
This way I can always make new content updates and won't be stuck on waiting for art.
but yeah... the things I have seen... the absolute body horror of failed AI images... no one should ever have to witness such things.
If I may actually give you some advice from a person like me who supports fair few games:
First impressions are important. If your game fails to impress, it won't make it nearly as far or fast as it would initially.
I understand fully the issue of not being able to draw your scenes. All good.
However, you should 100% invest in you actually making some kind of an AI model for yourself. If you're using someone else's, download it. People who make freely available models have often times tendency to delete them too. More so when they find out that people make porn with them and depending on their country laws, they can be held accountable.
Settle for style that is CONSISTENT throughout the entire game. With AI art, lot of people dislike inconsistency of the images that can be present in them.
After that is done, settle for the scenes. No placeholders but solid, concrete CGs that will be there for good. Polish them via photoshop if needed. Spend more time on the images than anything else.
It's a visual novel. Text is there to give context and build up the scene... and what makes a good game are its visuals too. That alone makes or breaks the game.
Voices are neat and all but if I may be honest - they are the least important part for most games. They are neat. Not critical. They can be easily added when solid, concrete foundation of the game is already built.
It would be good to spend good portion of your time on making AI generations of the "dialogue cutouts" of the characters.
You know, either faces or characters in front of you when they talk during scenes.
Make several versions with several expressions that reflect the situation. Maybe even have them in various poses so it doesn't become repetitive.
You can easily succeed with a game. But you got the remake parts of the game and put more emphasis of making the art feel like art. Then once you've done the remaking, do announce in the front page that big portion of the game has been remade.
That way people who were on fence and revisit it months later know to give it another chance.