The term 'Portrait Medium' can refer to two different mediums used in art: Oils (4 letters) and OIL (3 letters). Oils are a type of paint made from pigments that are suspended in a drying OIL, such as linseed OIL. This type of paint is known for its slow drying time and ability to create a wide range of colors and textures. OIL paints are often used in portrait painting because of their ability to capture subtle details and nuances in the subject's face. OIL (3 letters) is a type of paint made from a combination of pigment and a petroleum-based solvent. This type of paint dries quickly and is often used for creating bold, vibrant colors. It is also popular for its ease of use and ability to create a variety of effects.