As long as the color you are adding is the same value as the shape you are adding it to you can drop color anywhere. I like to drop cerulean blue into the darker fur on a dog because it looks less flat and dull if you do so.
This is Callie our new collie puppy. She is going to be one of the greats!
Please join my Youtube channel or tell a friend about it. I would love to grow a bit larger. To keep me engaged in making content.
I am a watercolor coach, watercolorist, and author.