Unidentified Hogwarts Teacher (I)

This male teacher is seen wearing a beret, a symbol of art. So we may presume that this teacher would be the professor of the extra curricular subject(s), Muggle Art or Art. Charity Burbage teaches Muggle Studies so Muggle Art could quite possibly be taught by her, if so it is unkown who taught it after she was murdered by Lord Voldermort.