I made my artifact by first creating a mask around Van Gogh's face. Then I imported both the original Van Gogh picture and the mask into Gimp. In Gimp, I created an inverted mask of the mask layer to create a layer just of Van Gogh's face, surrounded by black. I imported this layer onto the picture of starry night, selected just the black part of the face layer, gave that selection an opacity of zero, then gave the face an opacity of 50%.

Original Van Gogh:

Van Gogh Mask:

Starry Night (from Wikipedia):

Final artifact: