Skype recently introduced cloud based operation and started moving away from peer-to-peer messaging with a view, to paraphrase Skype, of improving the service that we receive.
Without going into the pros and cons of this, from a forensic point of view it is irrelevant anyway, the move has had the effect of introducing a new set of artefacts and in particular a new location for stored/cached image files (pictures).
More information here: https://support.skype.com/en/faq/FA12381/what-is-the-cloud
This article deals with the SQLite tables that reference to these pictures, the locations of the pictures themselves and how to join the relevant tables, decode the data held in certain blob fields and create a report showing who sent what to whom including the pictorial evidence where possible.
At the end of the article I will have shown how the different tables fit together and will provide a Browser extension that will create the necessary tables and import the