[2] Liska then worked as a commercial artist in St. Gallen, Switzerland, and went to the Königliche Kunstgewerbeschule München in Munich as a student of Emil Preetorius and Walter Teutsch.
He made a drawing of the "greatest ateliers in the world", a gigantic hall, which was to be erected in Baldham near Munich by Josef Thorak after a decision by Albert Speer.
In 1945 his Skizzenbuch aus dem Kriege, originally published in 1944 by Buhrbanck in Berlin in 1944, and all of its translations, was placed on the "proscription list of rejected literature" as number 17549.
The porcelain company Kaiser in Bad Staffelstein published numerous pitchers, porringers and most importantly plates bearing over 200 of Liska's illustrations of the cities of Aachen, Berlin, Danzig, Königsberg, Munich, Wroclaw and others.
In his illustrated autobiography Malerisches Kulmbach (1985), Liska admitted to honouring the works of Max Ernst, Oskar Kokoscha and Pablo Picasso.