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.