have also adopted his designs—notably the Landing of Captain Cook and the Sydney Harbour Bridge—while the Orient S.S. Co. has just awarded him first prize in the competition to improve its posters"[20]Clients included the Canadian Pacific Railway,[21] Bryant & May, Palmolive, and the magazine Walkabout established 25 March 1929 by its parent body the Australian National Travel Association.

He produced also some book covers, illustration and design, including Under southern skies, on the Dandenong Ranges, Mornington Peninsula and Gippsland for the Australian Publicity Council.

[26][27] Poster design declined in the 1960s as magazines and travel institutions increasingly used more affordable colour photography rather than specially commissioning graphic illustrations, for the sake of faster turn-around and for more persuasive realism.

[28] Trompf enjoyed a growing reputation alongside other poster artists James Northfield, Walter Jardine, Eileen Mayo, Gert Sellheim and C. Dudley Wood.

"[19] In 1985, surveying Australian representations of beach culture, historian Geoffrey Dutton equates Trompf to Max Dupain, Charles Conder and Sydney Nolan.

[32] They promoted the simple joys of sun-worship,[25] surfing[33] and bushwalking,[34] which were then becoming popular alongside a general interest in 'body culture' then pervasive among the young,[35] famously celebrated in Trompf's best-known poster simply titled Australia.

[37] Symes perceives that railway posters of this period using state-of-the-art techniques of the new field of commercial art developed Victoria's tourist geography, locating, labelling, visualising and imbuing places and regions with specific recreational and leisure attributes[38] and Pocock attributes such responsibility, on a whole-of-Australia scale, to Trompf's 1933 poster [39] in advancing the Great Barrier Reef as one of the most significant tourist destinations.

[43][44] The nostalgic attractiveness and historical interest of Trompf's posters endure; they are frequently included in public exhibitions,[45] they have become collectible national treasures[46][35] and they fetch up to $A12,000 at auction.