Perhaps you want an angelic halo, such as that created with backlighting, or a darker feel like that created with double backlighting.
Is it joyous or uplifting? If so, you might want techniques that emphasize the light more than the shadow, such as broad lighting, loop and Rembrandt lighting, or butterfly and clamshell lighting. Would you prefer to create a darker, more mysterious portrait, then perhaps short lighting, underlighting, rim lighting, or variations of split lighting will work better. Perhaps you want an angelic halo, such as that created with backlighting, or a darker feel like that created with double backlighting.