https://sites.google.com/view/kinder-paint/how-to-use-watercolor-pencils

One of the most significant advantages of painting with watercolour pencils is that you have the control of pencil drawing with the polished look of brushed on watercolour paint. As a result, they're fantastic for fine detail work, either in place of or in addition to paint. They can also be a good transitional tool for artists who generally draw but wish to try out translucency and layered colours.