Increase the Density parameter to directly multiply the number of scratches. Smaller scratches are added by raising the Roughness value. The overall size of the lines is modulated with the Size parameter.

If you increase the Distortion argument, the scratches become distorted by a noise function, which leads to textures like that visible in Image 2. The Noise value amplifies another noise function that is added to the scratches pattern.

Regulate the intensity and contrast of the scratches with the Amplify value.

The angle of the scratches can be adjusted at the Direction panel.

Let the scratches' angles variate by increasing the Turbulence value.