Consider Petrus Christus's A Goldsmith in His Shop and Amy Sillman's Nut. These two paintings present two very different styles of oil painting. Analyze the works and the stylistic differences between them. 

What will be an ideal response?

When oil paints were first introduced, most artists, including Petrus Christus, continued working on wood panels. Christus employed a slow and time-consuming technique of glaze building that yielded a meticulous, detailed image. Gradually, however, artists adopted canvas instead of wood, as in Sillman's work. Further, Sillman's piece conveys a more spontaneous approach of laying paint down on the canvas, including showing the underlayers of paint.