In this download 11 presets are included that I made for portraits. They may also be applicable for other things, but you can try that for yourself. Again, don't forget: A preset is a preset, you probably have to adjust it to the characteristics of your photo. So learn all possible settings well by playing a lot with them and seeing the effect.
You can easily install the presets in Silver Efex. If you have started Silver Efex you will see on the left, where the examples are shown, a choice "Imported". On the right-hand side there is a +, by clicking on it a window opens in which you can look up and install the presets, so very easily.
Below you can see the examples of the presets with the names. You can determine which preset you want to install based on the images. Click on the photo to see it enlarge on a black background.