A picture will be visually looking good when all these things are right.
– silhoutte
– composition
– structure
– layers
– colors
– greyscale
– 2 level shading

(not talking about concept / ideas / stories etc..)

I picked a few pictures that I specifically like the color. Now I understand why…

Useful links
https://color.adobe.com/create/color-wheel

Neutral color = black, white, grey, skin
so these color doesn’t count