Add details to the eyebrows
Once the basic shape is in place, accentuate the realism by adding details. Eyebrows are not homogeneous masses, they are made up of individual hairs that overlap and create a unique texture. To illustrate this texture, consider using small lines to represent the hairs. These lines should follow the direction of hair growth as you observed in your model or reference.
Work with shadows and lights
Lighting plays an essential role in the realism of the drawing. Consider incorporating highlights and shadows into your brows. Typically, the inner side of the eyebrow is darker, while the outer side is lighter. Use this rule to your advantage to give more depth to your drawings.
Take care of the eyebrow environment
Don’t forget the environment of the eyebrows: the eyes, the forehead, the nose. These elements must be drawn with the same level of detail for a harmonious and realistic rendering.
Ultimately, the key to drawing realistic eyebrows is practice. Don’t be afraid to experiment with different styles and techniques until you find the one that suits you best. With time and patience, you will develop your own method for drawing eyebrows realistically. And remember, drawing is an art, and like all art, it should not be rushed, but enjoyed and savored.