One way to get started is find a Material that is intriguing to you.
Then take it apart piece by piece and analyse the individual bits…
The following may help or confuse, just take it as attempt to help:
Imagine a room you must decorate for a baby on the way:
The actual Wallpaper
A plan of how the Wallpaper pattern should fit over the walls
The parts of the Wallpaper that stick out or recede
(Especially when viewed at an angle / from the side)
Brochure showing general patterns to be used in the design of the Wallpaper
Painting fixed sun / lamp shadows on the walls instead of using real lights
A layout of the types of colors to be used on the Wallpaper
(Might include all the textures too)
A photo of the light in the room to help you recreate that same light later on.
File format like Docx to store models / exchange work between different apps.