Pastel would be a great alternative for your commissioned painting if you want something charming with deep, rich colors that shine nicely on paper. It works well, especially for landscapes.
Although pastels have been used since the 18th century, they may have their roots in the colored chalks used for drawing in the 16th century. Because pastel is applied dry to the paper, the artist may forego the preliminary procedures of sketching a basic line drawing and selecting a broad color palette in order to begin adding color to the composition right immediately. Pastel is not as well-known as other painting mediums like watercolor and oil.
When compared to a sketch or study, a pastel painting is more akin to an oil painting due to the use of more complex techniques and a wider variety of pastels. Most pastel paintings are bursting at the seams with life and feeling. Pastel paintings may be better able to depict the nuances of light and shadow than other mediums.