I went back to the plate in my post ‘Mezzotint done improperly‘, and burnished a few features into my Spiky Cat. Now he looks like this:

I also added a little more detail with the mezzotint rocker (before burnishing). He used to look like this:

I think it’s an interesting effect, but I wonder if the approach has a wider application or whether it is mostly suitable for drawing cats like this? It would be interesting to find out sometime. Below is a photo of the printing plate as it now looks:
