Portrait of a mentor: 'granddaddy' of National Art School campus finds himself the subject

Papua New Guinean student Lesley Wengembo has painted campus assistant Mal Nagobi for Australia's famous Archibald prize

Alongside Malachi Nagobi, progress across the august grounds of the National Art School in Sydney is constantly - happily - impeded.

Mal!" comes a voice, hello Mal," another. Every handful of steps, another person wants to stop to chat.