Swinney pictured joking with Yousaf and Sturgeonpublished at 15:21 British Summer Time 7 May
Earlier, Mr Swinney was pictured joking in the chamber with his two predecessors.
Humza Yousaf was Scotland's second-shortest serving first minister after Labour's Henry McLeish.
But Nicola Sturgeon held the post for more than eight years, which is a record, before she resigned last February.
Mr Swinney is poised to be elected as the country's seventh first minister in 25 years.