[1] He was inspired by the work of the American artist John James Audubon,[7] and he is known to make extensive studies of flora and fauna for his paintings.
[1] Micallef's first personal exhibition was held in December 1986 at the annex of Saint John's Co-Cathedral in Valletta, and it consisted of paintings of birds.
His third exhibition consisted of a different subject, architectural heritage, and it was held at the National Museum of Fine Arts in Valletta in August 1999.
The stamps consist of paintings of marine life, birds, cacti and succulents, seashells, mammals and reptiles, insects, domestic pets and dogs.
He has also entertained audiences in other countries, including Italy, France, England, Ireland, Spain, Portugal, Germany, Hungary, Greece, Libya, the United States, Canada and Egypt.