First I look for references about the illustration.
In this step I make a very rough sketch.
Now I switch to a cleaner sketch where I can see each color and texture will go.
I select the color pallete to use in the illustration.
Now I started a color sketch to see more integration.
With the colors that were chosen, I finish the entire illustration without the textures.
Now I setup every texture in your place, and the illustration is done!