Painting in progress (in 7 steps)

Hi steemit friends,

today I'm going to show you my last painting. Actually, it is two paintings, but I'm going to show you the first part.
Why is it so bleu inside and orange outside?

Title: Fenêtres (Windows)
Dimensions: 40x60 cm

All the steps:

Soon you will see the second part.
I hope you like it?