The artist in question is Alex Colville, a Canadian artist who was educated at a small but prestigious Maritime undergraduate university called Mount Allison… the very school from which your humble blogger graduated with a B.A. in English and Philosophy in 1993… the very year that Colville’s early works and war art were exhibited at the university's own Owens Art Gallery before being sent out on a nationwide art tour! Indeed, Colville was present, acknowledged and honored during that year’s convocation ceremonies, and I got to shake the great man's hand. I even spent four out of my five years at "Mount A" living in an all-male dorm (Trueman House) that had a meeting hall featuring a huge mural painted by Colville.
See the essential Overlook Hotel blog for more information about where and how 4 of Colville’s paintings can be found hidden throughout The Shining. As for why Kubrick chose to highlight this artist’s work in his film… your guess is as good as mine.