Del, assuming that Ron Hutchins took this photo on the same trip as he took the 'Brazilian Marina' and the 'Ioannis Colocotronis', which I think is highly likely, then we can date this as pre June 3 1976; as Lloyds Index shows the Regina sailing from Rotterdam on June 3 for the Persian Gulf.
Additionally, this is at a very early stage of her 'drydocking'/maintenance at Verolme's.
The bunker barge(s) alongside are likely to be accepting tank cleaning slops rather then providing bunkers.
So, a guestimate would be more than three weeks before she sailed, i.e. circa 6 to 13 May.
This puts a loose date on the other two ULCC photos you've posted.