Many of Reiners' works have not survived, but some can be found in relevant auction catalogues. The focus of his artistic work was portrait painting, especially in the area of the Rhenish and Westphalian nobility. In addition, he was engaged in Christian works. For example, he was largely responsible for the restoration of the altarpiece in the in Eupen, the copy of the painting Assumption of Mary by Peter Paul Rubens made by an unknown artist. He also worked on moral painting, for example on the portrait Die Kartenlegerin, which is considered lost. He also painted interiors and atmospheric landscapes.
