Hello #hive 
I started by assigning the AI toon shader on the CG elements, Kept all white and wanted to see how much I could push the black painted lines, These lines based on the model, The mode details your model got the more details in paint you will get
After I'm happy with the first look, The length of the lines and all I moved on to the next step which is adding my original textures back, Which was basically some painted textures I did with substance painter and photoshop, With the toon shader you see most of the elements will get a nice highlight/shadow shades depends on how you move your light around, But not in a contrast-y way so you can see feel the cartoon look overall
I started with a blue dome light for the mood, Adding some bouncing values so its not 100% dark in the shadow areas
After the mood is set up, I start adding secondary lights creating a balance between yellow and blue
Final look, Adding some volume and final touches
This is the Toon Shader Tutorial by Roland Reyer, It helped me through out this project, It teach you about Arnold AiToon shader and the attributes
Ronald Youtube Channel, You can check it out for more CG tutorials
https://www.youtube.com/channel/UCmQ3DfQa2WY3zGy2B3jKn0Q
Video break down
Maya | Arnold
For more work's Feel free to go through my works on Vimeo
https://vimeo.com/ahmadturki
artstation
https://www.artstation.com/ahmadturki