Besides the on-line exhibitions such as Saatchi's and others, Karl also takes part in physical exhibitions since 2016.
He keeps these, however, limited to certain quality standards. You can find his work at:

Salome Art Venture

Van Schaik & Van Schaik Gallery

the Millionaire Fair

Satura Art Gallery (Sept. 2017, Italy)

DigitalArt Factory (Rome 2018)

Masters of LXRY 2020