29/50 art

More painting backgrounds. Is hue, saturation, brightness is all you need to paint..?
On top of that, there's reflection, the surface material, and air density.
I wonder what else there are.

さらに背景を描く。色調、彩度、明度で絵は成立してるのかな。
反射、素材、空気の密度、など。他に何があるか。