You color your skin, usually put a word or some artistic design, some picture on your skin.

你给你的皮肤上色，通常在你的皮肤上放一个词或一些艺术设计，一些图片。

Then, one can take the liberty of making artistic designs in the froth with the concocted tea paste.

然后，他便可以用调好的茶膏，自由地在泡沫上作画。