I had the same thing happen. I didn't have enough Lust so the image is just her naked and that's that but if you lose a few times to slimes and raise your Lust enough before triggering the scene you'll have the option to masturbate watching her, the image will change that that one didn't stick on the screen for me.
i just started playing and when I went to the waterfall to spy on i think fina.
Another(more annoying) option is to just teleport back home bump into things until you are outside and talk to someone, triggering a conversation seems to reset the on-screen picture... I didn't have the teleport spell so I had to Bump and feel my way all the way back to town to make the pic go away x_x even saving and reloading doesn't work when trying to make the pic go away.
I should say I didn't use RPGEdittor for Carla, it wasn't until I got tired of trying to build up points thru game play I decided to use the save editor to cheat with relationship points. So Carla is available to the MC without this cheat, and I didn't really play out much after using the editor. The oracle at the Inn isn't appearing, or this was cut by the dev so I can't really get anywhere in the game.
IT FINALLY HAPPENED !!! Took about 10-15 more tries but the scene finally proc'd. I saw her standing there and had a flashback to when I last saw her standing there was early in the development when there was No art for Carla at all. IDK if Jill appearing was a catalyst or not but it happened the day after she appeared. Damn ! she is Thiiiiiicc. The Dev needs to animate a scene with Carla it would be a crime to not make that booty Jiggle and add a nice hip smacking sound effect for good measure, an ass like that deserves to have an entire night spent exhausting on it. Now that I think of it there also should be a countertop tittyfuck scene with those ginormous juggs of her's.
Ummm Oracle ? there's an Oracle in game ?
Unrelated note: IDK if the Developer changed Krowley's art or not but I never noticed how feminine his face looks until the Orc mentioned it. I got curious about what happens when you keep drinking with the orc, shouldn't have been surprised but I was hoping that was a female orc. I don't remember Krowley's ears being pierced either the first time I played through.