[1] His main creation in Sweden was the execution of the sculptural programme of the staircase and hall of Drottningholm Palace, the private residence of the Swedish royal family.

In the years 1664 and 1665 he is in Amsterdam where he assisted the Flemish sculptor Rombout Verhulst with the execution of sculptures in the City Hall.

[8] Millich was sculptor, architect and designer of armor, festivals, furniture, lamps and ephemeral objects such as cake.

The skill in the latter enabled him to complete assignments for smaller objects such as frames for paintings by David Klöcker Ehrenstrahl, wig stands, glove forms and board game trays.

Millich was an eclectic artist who worked mainly in the Palladian classicist style that had been promoted by the Flemish sculptor Artus Quellinus the Elder who had created the sculptural programme for the large city hall building in Amsterdam.

[6] Millich's most notable work were the statue carvings decorating the staircase and hall of Drottningholm Palace.

[6] He also worked on the decorative wood carvings in the queen dowager's bed chamber, in collaboration with his assistant Burchard Precht.

These were later incorporated in two vanitas still life paintings by the Dutch artist Cornelis van der Meulen which hung in their grandmother's prayer room.

For the Imperial Councillor Erik Flemming he produced an epitaph in black and white marble in the church of Sorunda in Södertörn.

He designed a Baroque tower top with an octagonal superstructure, which ends with a small lantern turret.

The upward lines of this lantern turret consist of herma statues with naked male torsos that look like functional caryatides.