Who had a very successful career as a royal painter, and spent most of his life decorating Versailles and

Francois Boucher is the answer

François Boucher

Explanation:

He is one of the most important artists of the Rococo period and a decorator (interior designer) with a distinctive style. Many of his paintings portray landscapes, mythological elements, the romantic and gallant style of the 18th century, and pastoral portrays.