The Box said the Beryl Cook exhibition had welcomed 52,000 visitors with nine weeks of its 18-week run remaining.
It said 45% of those travelled from across the country, which it said demonstrated its “remarkable reach and its impact on Plymouth’s visitor economy”.
Pomery said it was “wonderful” to see people “turning up in their thousands” to celebrate the Plymouth-associated artist.
“Many of them are visiting The Box for the very first time, and we hope this is the beginning of a long relationship,” she added.
Amanda Lumley, CEO of Destination Plymouth, said the Cook exhibition had given “a real boost to the hospitality, retail, and tourism economy” and was “making Plymouth a place people want to visit and return to”.
The free admission venue added that the Journeys with Mai exhibition, telling the story of Mai, the first Pacific islander to visit Britain, featured Plympton artist Sir Joshua Reynolds’ portrait of Mai and had welcomed about 25,000 visitors.
