Had to take Color Theory to get my BFA. We learned things like the "speed" of colors: yellow is the "fastest" and purple is the "slowest". Only a little yellow is needed to balance out a lot of purple. Same for balancing the other colors. You use these balances for guiding the eye (lots of yellow on a purple field).
When you keep this in mind, diagrams or not, then the output will be "pretty" (not jarring) and "informative" (guiding the eye to the most relevant info).
Had to take Color Theory to get my BFA. We learned things like the "speed" of colors: yellow is the "fastest" and purple is the "slowest". Only a little yellow is needed to balance out a lot of purple. Same for balancing the other colors. You use these balances for guiding the eye (lots of yellow on a purple field).
When you keep this in mind, diagrams or not, then the output will be "pretty" (not jarring) and "informative" (guiding the eye to the most relevant info).