Create multiple images with similar styles

Hi - Does anyone have any tips for generating several different images which all look stylistically similar? For example, when illustrating a book, the images would all be of different things, but would need to look somehow consistent (illustration style, colour palette etc.). With Firefly I'm finding that even if I use the same preset styles, I get drastically different outputs depending on what is in the image. For example if I just use the basic Origami material and ask for an image of "A removal truck outside a house in autumn" then I get something that looks kind of abstract and illustrative, as expected. But if I ask for "A park with kids playing in the background in autumn" then I get things which are all far more photographic (rather than something that looks like paper), which won't work alongside the other image. I've just used origami as an example, but I'm finding the same issue whatever settings I use. Thanks!