When I made this I stared by making a contour of the original masterpiece called "self-portrait" By Vincent Van Gogh... after I made the contour I went into Firefox and got a large image of Homer Simpson i used the magnetic lasso tool the placed it on the original picture. I then used the eyedropper tool to color the background and clothing.
for the Mona Lisa assignment i started with a contour drawing then colored it added a background put gradient in her hair, put a towel over her shoulder by erasing the background in the selected area... i also did this with her floral shirt, and grass skirt.
I had lots of fun doing the scream assignment. What I did in the start was make a contour drawing, coloring it in with the paint bucket tool, then going in to photo booth and taking a picture of my face in the scream position. After taking the picture i aligned it with the scream body put a filter on my face then i was done.