Advice on how to repair varnished flooring

[Harmlessmischief]

Hi, I wondered can I ask some advice? I have some varnished floored which had some scratches and a carpenter made a mess of trying to fix the scratch. He sanded the area and now it looks different to the rest of the floor and his footprint from his shoe has gone into the soft wood. Can anyone advise how to fix?

[Harmlessmischief]

Attached some photos of the floorboards now