Having picked up the necessary layouts, I set to work on the visual component. The
Dreamlike service helped me a lot with this, in which I was able to quickly create characters and environments. This allowed me to work without concept artists and 3D modelers, although the result is inferior. However, the generated images are enough to convey the idea and support the game's UI.
So I started to add UI design to the wireframes.
I found really useful to add mockups to the photos to check how does elements sizes works :)