I'd love to, but images aren't really my forte. Maybe I'll add some one day, but my current plans are to keep it text-only.
I think the game should stay text-only. A lot of small indie projects like yours in this genre start with text only, then decide to add images but the scale and cost of doing so makes them drop the project. Staying text only will reduce the workload significantly compared to adding images and it will also make updating the game by far easier. If you really wanted to add an image, maybe a title page background but I don't think it is needed.