Y'know what's super fun to do while rendering (shading)? Using darker colors in different hues than the base color... Like, the base color for the blond guy's clothes is black (not pitch black, but a dark grey that implies black), and you'll be able to add some interesting rendering by making the shade color a dark purple or maroon instead of black. Does that makes sense? I'm bad at explaining. Lemme make some quick images to show an example.
(I made this really quick just now, sorry for the sloppiness)
The sphere on the left is what you'd expect rendering to look like, but if you observe nature closely you'll see that this situation rarely ever occurs. Colors reflect just as much as light does, and they interact with nearby objects that they're not even touching. I used blue as my example, but you might want to experiment with other colors that show up in that pic.
It's not a technique that one
has to use, it's just something interesting and dynamic that can really change the entire appeal of the image in a subtle way.