Oil Painting Process
This excellent video by Youtube expert MrPicment is an entrancing example of building up a composition using a very dark, textured background, and then adding lighter tones to create the final portrait.
The process of adding layers of color is one of my favorite things about oil color. In acrylic painting, by contrast, you most often directly lay down exactly the color that will be seen in the final painting from the get-go. What you see is what you get. In oil painting, the artist is uncovering a mystery, one glaze at a time. This video example in particular reminds me of lifting one veil after another until we finally meet the woman underneath.