Color Theory

I uploaded a picture I found through one of my favorite photographers that had mostly green and grey based colors. I really liked the tones because they were calming and not too bright. The two different greenish colors in the design are from the same hue only one is a tint, because white was added to make it lighter and the other is a shade which is darker by adding black to it. The other color is grey which is just even lighter than the light green, and the tan color is completely different than everything else and is   most likely a tint of orange.