This mural is a copy of "portrait of a couple" by Frans Hals (1662) now made by urban artist Thermobiel. It is part of an old masters by new masters project conceived and paid by the ING bank as sponsors of the rijksmuseum making a connection between the old masters and street art. I am not sure what the connection is and think that the old masters will be spinning in their grave. You can also find a Rembrandt and a Willem v.d.Velde somewhere in the city centre. One for monday murals here.