Towards the beginning of 1914, Hungarian-born London art critic and historian Paul George Konody examined the painting, and concluded that, unlike Wilhelm von Bode's bust of Flora (which Konody had correctly discerned was falsely claimed as Leonardo), the painting was in fact by Leonardo. Konody wrote that the reception of the painting had been marred by "some press agent who sent out the news broadcast, with wrong statements, misquotations, and other blunders galore", but nonetheless found that "though not altogether from the hand of Leonardo da Vinci himself, it emanates most certainly from his studio and was very largely worked up by the master himself". Blaker's step-father, John R. Eyre, published a monograph in 1915 that suggested a partial attribution to Leonardo. Eyre cited Konody's evaluation defending the authenticity of the "Isleworth Mona Lisa" as the motivation for his monograph, "when this opinion was endorsed by an art critic of Mr. P. G. Konody's standing, I felt convinced there was at least good ground for investigation". In this monograph Eyre was the first to formally propose the painting as an earlier version of the "Mona Lisa" at the Louvre. Kemp notes of Eyre that "His little book of fifty-one pages is full of careful scholarship, and makes about as good a case as can be made".