Trying to achive a specific kind of ArtStyle for a mobile game.

I have a quick question,

I’m currently working on a mobile game title and I would like some ideas on how to achieve
a very flat texture look like shown in the image I attached.

Also is there anything special I need to do to make it work in any way
different to make it work with mobile(android/iOS)?

Thank you all in advance for any kind of help!

It’s an orthographic camera projection, with good baked lighting.

Lighting baking is impossible in the kind of Project I’m working on.