If I search google for the phrase "rgraph about" I get the little boxout pictured below. Whilst this has my logo - how would I go about adding a description too?
The Google Knowledge Graph Search API informs us:
So, will it be useful for you to use structured data on your website for the best presentation your business or your as person in Google knowledge panel.
Further, the above guide Google reports a list of object types that can be supported by the Knowledge Graph:
Choose and apply the types that most fully can represent the main content of each separate of your web pages. Read more Structured Data General Guidelines.
To represent your logo in the Google Knowledge Graph, refer to the Guide of Google for Logos.
Here you can focus your attention on the requirement for the property logo:
Additional image guidelines:
The image must be 112x112px, at minimum.
The image URL must be crawlable and indexable.
The image must be in .jpg, .png, or. gif format.
So the logo of your organization should be square. I recommend to use this property with the embed type ImageObject that is more detailed structuring your logo.