Hi Everyone,
I am back with a new project - from the video game named Gris, I will do the tower scene with a few modifications. You can see my blocking down below in Unreal Engine. Also, I will share with you my references and asset inventory. Most probably I’ll solve many things with modular systems so I don’t need to model all assets one by one because that would take me forever. 
I have already started experimenting with the textures to see if I am able to create this water color painting look. I am, so I will be texturing in Substance Painter. 
Next week I will start with some of the assets, haven’t decided with which ones exactly. I need to create the modular systems as well, make them easy to understand and clear so I don’t get lost in my head.
I am open for any help, idea, opinion on this.