Men (at least the highly fashionable ones) wore many accessories in the 1920s. Notice the different types of hats (here we see fedoras, straw boaters, and Newsboy hats). Canes were popular accessories as well as small rings, tie pins, and collar pins.
This image from the 1920s, is created using simplistic colours; this is most likely due to the era in which it was produced as there was limited media available to experiment with. The painting contains a lot of detail on the garment and minimal detailing on the face. I prefer a fashion illustration to be created in this way; with the garment as the primary focus.