Step 3. Adjust the parameters of the Oil style.
To make the strokes more expressive increase their length, width and curvature:
For the strokes to be apparent, increase the value of the parameter Stroke Density, it will increase the number of strokes. If a random stroke is out of place (for example, across the nose), and the Stroke Direction is not available, you can change the value of Stroke Density until you get the best version.
The image will look better if we make the colors brighter: