Personally, I would start with one light source only. Play around with different positions - one axis but higher, slightly off the axis, more off the axis like you've done here, and then various distances away from the subject. From there you'll learn to get a feel for how different positions affect mood. Learn about broad and short lighting and how it affects the model and when you might like to use it.
A couple of rules of thumb: the light is better higher than the eyes in most situations because that it how we see light from the sun; try to keep the catchlights out of the sclera of the eye (white bit); try to avoid specular highlights - tough on shiny skin.