Gregor Wosik's art form resembles a bit more closely to Julian Beever than Kurt Wenner or Edgar Mueller. Kurt Wenner tends toward symbolism with a religious touch while Edgar Mueller is more inclined towards large scale landscape project with his successful "The Streetpainters" company. Gregor Wosik and Julian Beever both have styles that attracts attention through radical conceptions or powerful emphasis on a single element.
For example, the single eye catching point of the gate piece is the curious dog poking his head out from behind the gate. A very fascinating artistic use of emphasis.
Each of the street artist has a disposition towards a certain style. Gregor Wosik and Julian Beever's styles are just one of the many styles but this style is very visually enticing and fun. Involving spectators into the artistic production is an excellent way to humanize and add a bit of realism to the work. Interacting with spectators also works wonders to emphasize a scale effect.
Note that some of these compositions were joint productions with other artist such as Edgar Mueller, Marion Ruthardt, and Manfred Stader.