The paint is different oxides. Unglazed. The deck troops will have bronze spears and the kybernetes some tillers.
This is a first attempt and I will make a full-size one soon.
A few oars did not survive firing and my handling.
The colours are bit scary but, as with ancient sculpture, a lot of the keramik items were originally gaudily painted. The B model will get a coat of terra sigillata before painting to make the colours even brighter!