I don't think that feature exists within Ren'py (the engine we used) without making all the images fully accessible, which we were a little apprehensive about doing in case they got shared around. Maybe in an artpack with watermarks though, it's something me and Duski need to discuss. That said, I can help you with tying up Crow. Towards the end of the scene, you can enter as Roman, or you can leave Crow and Carmen alone. You get different art at the end depending on which you choose. I think you haven't tried leaving them alone ;) - Hallows