explanation -
<em>I believe this would fall into the 'Art' category rather the English category, but I think the best answer would be </em><em>Lighting</em><em> (how light affects your portrait) </em><em>Angles </em><em>(and how angles affect the mood & feeling of the subject) </em>
Its a prepositional phrase because it doesn't have a verb. If you have any more question feel free to ask me.
I think e because a primary source is first hand so you know all the details about what's happening during that time.
