One of the nice things about being married is you have a model to draw or paint all the time. I do two or three pencil sketch portraits of her every day, and quite often I’ll ask her to sit for an oil portrait.
I like to light my portrait subjects from the side and show shadows and highlights on the face. There are some subtle things that can be done, such as color reflections. The painting on the left shows the red from her shirt reflecting on the side of her face and above her neck. The lips are a smoother surface, and always pick up a highlight.