Learning to see the details around you; what a leaf or tree for example looks like when you are standing next to it versus how a tree or the detail of a leaf look in comparison farther away or distance. Take the time to look and notice color and how the color changes and the details or realistic details slightly become unfocused as they go back or a way from you in distance.
I advise you to start thinking about color or graphite in values [one to ten; light to darkest] for all colors as well as grays/blacks. Are they warm or cool in tone? Warm tones will come forward in space and cools will sink in space. The way God designed it, not an artist trick. Think about how color fades in distance and lack of detail in landscape.
Don’t worry so much about the name of the color printed on the tube of color, look to see if it is warm or cool in tone and where would you use it on form, shape etc.