Painting multiple light sources is like chasing a ball down a hill, good exercise, but you can’t get it till you hit the bottom. I have always been so amazed by artists that capture light so beautifully. They make it look effortless, even though it can be quite time consuming, not to mention the fact that it uses a lot of brain cells. However it is most definitely worth it, giving the painting depth, mood and a vibrant dynamic that just makes everything so dam pretty. It takes time to learn to make lighting dynamics from imagination, even then its still a good idea to uses references. I for one spent a lot of time planning this piece, and I wouldn’t change that process confidently.