Continuously meditating with the intention of empowering the pineal gland will help to bring regularity to your skill. Much of what needs to happen with your pineal gland is decalcification and you can explore that through several google links.
Practicing everyday also helps. We naturally see auras, many not knowing what they are looking at or for. After decalcification (preparing your pineal gland), you can do exercises to strengthen your auric senses. I find that it's best to practice on one's self than other individuals. Practicing everyday for a month. Twice if you have to. If you can naturally see them, practice will work better than any spell, because you will still have to distinguish if what you see is natural or what has been programmed in your subconscious.