The performance portraits had started in earnest, she said when Stephen Diaz sat for her three years ago at her home.
It was at the request of opera school executive chairman Donald Trott.
"I worked and he sang - my little house was filled with his beautiful voice."
It meant she was able to capture the power and the energy of his voice as she painted, she said.
"It was in the moment ... a response to everything happening in the moment."
After moving to Wanganui from London eight years ago she's now very settled, she said.
Priest feels her love of music, beautiful voices and visual art have led her to this point where she will work for years.
"I'll never retire."
At Wednesday night's event, internationally acclaimed tenor Simon O'Neill, a student in the first year of the school in 1994 and this year a tutor, delighted the audience at the gallery by singing two arias.
In honour of Felicity he sang Recondita armonia from Puccini's Tosca.