Kush predominantly works in the medium of oil painting on canvas or board, with many of the original paintings also sold as limited edition giclée-on-canvas prints. His bronze-colored sculptures are small-scale and usually based on imagery from his paintings, such as Walnut of Eden and Pros and Cons. Although his style is frequently described as surrealist, Kush himself refers to it as "metaphorical realism" and cites the early influence on his style of Salvador Dalí's surrealist paintings as well as landscapes by the German romantic painter Caspar David Friedrich. Another influence on his work has been the 16th century Dutch painter Hieronymus Bosch, known for his fantastic imagery and sometimes characterised as "the pre-Surrealism Surrealist". Wings, ships, and color-saturated seascapes are frequent themes in his paintings, exemplified in the companion pieces, Arrival of the Flower Ship and Departure of the Winged Ship. Flowing water is another recurrent theme, exemplified by Breach and Current. Other works such as Three Graces and African Sonata merge human and animal forms with inanimate objects.