The aim of an illustrative visualization method is to provide a simplified representation of a complex scene or object. Concave and convex regions are emphasized and the surface complexity is reduced by omitting unnecessary information. This abstraction is often preferred over fully illuminated scenes in a multitude of applications. This talk presents an overview of the state-of-the-art for feature lines. Additionally, an evaluation is shown to assess the quality of feature lines on anatomical data sets. Based on the evaluation, two conclusions in the field for medical applications were derived. From this point, this talk presents two solutions in the field of illustrative visualization for medical data sets. A novel line drawing technique will be presented to illustrate surfaces. According to different requirements, this technique will be extended for molecular surfaces. In the field of vessel visualization with embedded blood flow, an adaptive visualization method will be introduced. This technique will also be extended to animated blood flow. Finally, this talk shows different illustrative visualization concepts, which can be applied in various fields for depicting surface information.