Difference between Have a face as long as a fiddle and Have a face made of a fiddle

have a face as long as a fiddle—look dismal or extremely depressed:

• I saw you yesterday and you had a face as long as a fiddle. What was the matter with you?

have a face made of a fiddle—(arch.) be irresistibly attractive:

• A person who was well-liked had a face “made of a fiddle,” meaning that it was always wreathed in smiles, as a fiddle has a much-curled shape.