How to make Cartoon-like scene lighting?

The solution is going to be in the shaders you use, there isnt a global setting for getting this type of look from all the objects in a scene. I suggest looking at different toon shaders. Some will be too cartoon-ish (with the thick border lines), but with some fiddling i am sure you will get something you like relatively quickly.

//EDIT

Try tossing a material with this shader on a cpl objects and see if it meets your needs. Seems like it will be closer to what you want.

These use no lighting and allow over brightening. Thanks to Eric5h5 for these: Vertex Color unlit.

Or just browse the unity community shaders here.

Let me know if you find something that works great for you.

Yeah I have tried with default Diffuse shader (facepalm)

I meet hard in lighting, it's not a global light like that (you can see that the point light cannot shine all the scene) When I use directional light, the scene is too bright, sometime too dark. :(

I want to find an example scene like that, it will be easier to reference :D

You can adjust the ambient lighting in the Render Settings (in the Edit menu). The default ambient lighting is gray. Try changing it to something closer to white.