The fourth national heat in Cardiff sees the final 21 artists creating portraits of rugby player Gavin Henson, Falklands veteran Simon Weston and writer/model Sue Tilley.
The four episode winners have their portfolio's reviewed by the judges before travelling to Paris both for inspiration and to paint the author and fashion model Sophie Dahl.
The first winner of Sky Arts 'Portrait Artist of the Year' undertakes a prize commission to paint award winning historical fiction writer Hilary Mantel for the British Library's permanent collection.