In botanical painting one has to be really careful and accurate with choosing the right colors. A good idea to know your colors better is to play with them. You can mix your colors in a sketchbook, you can make your own swatches and colors charts. Eunike Nugroho, who is an amazing artist, her works are just mind-blowing, showed on her blog how to make a radial color chart. It is very, very good idea and her charts are just beautiful.
The most basic way to make a color chart is just to paint all the colors you have. It's very important to write down the name of particular color. I also write the brand and the pigments that are in the ingredients.
|My watercolor chart of Schmincke Horadam and Winsor&Newton paints|
Another way to make simple color charts is to draw a grid and mix the colors from above with those from the left side (or the right side if you wish). I've made quite a lot of charts like this and I have to say they can be really helpful. When I'm looking for a particular color, I can take a look at those charts and I see what I have to mix right away. Here are some examples:
You can also make these kind of color charts a little bit more complex. For example you can add a tonal range of your colors. Let me show you some examples:
I have a video showing how I was painting color charts like those above:
Painting tonal range can be sometimes difficult, because you don't know how much paint or how much water you should use to make the tone darker or lighter. I also recorded a video showing how you can paint a tonal range. Here it is:
The best way to know you colors better is to experiment, practise, play with them. There are so many colors to discover!