Pub is a preset that you can use in Silver Efex which gives the photo an expressive appearance, I find it particularly suitable for indoor photography, in this case in the pub. I made the preset to show detail in all corners of the pub, but of course it can also be used for other purposes, you can try that yourself (I haven't done that yet). If you want a darker atmosphere you better use another preset such as Dark Mood. When using this preset I bring a lot of accents by playing with light and dark and with structure. More structure gives more accent. The fine structure in particular is used here for the detailing. You can download the preset below. Install it in Silver Efex. At the bottom of this article is a link to a brief instruction how to install presets.
An example of the before and after situation: