Which tip is not recommended when drawing with polyester lead?

The option indicating that one should always draw on the glossy side of polyester film is not recommended because this material often has two different sides: a glossy side and a matte side. The matte side tends to hold drawing media better, which can lead to more precise and controlled results. Drawing on the glossy side can cause the media to smudge or not adhere properly, which negatively impacts the quality of the artwork.

In contrast, retracing lines for the best line density is a recommended practice, as it allows for the establishment of more pronounced and clearer lines. Pressing more firmly when using polyester lead is acceptable due to its unique properties that allow for firmer pressure without the risk of damaging the material, which differs from graphite that requires a lighter touch to avoid smearing. Using a light touch for delicate details is also advisable, as this technique allows for greater control and the ability to create fine, intricate designs without compromising precision.