This is how the Polystyrene eggs are painted:
With the Strich-Ex pen, motifs can be easily sketched out, the lines of the pen disappear after some time. With pastel Handicraft paint the eggs can be primed according to your personal taste.
Dots, serrations and petals as on the decoration examples can be painted very well with brush pencils (Brushpen). These pens are of course also suitable for labelling.
Afterwards only still with fine Silk paper line and close.