This part can be difficult in some cases or it can be easy. Depends how are you with seeing light, and then even when you find great interesting light you'd need to ensure it falls onto the subject(s) properly, as well have an appealing composition.
If you've just jumped into this part of the blog series I highly recommend you read the past parts as this part is spoke with the assumption you've read the past parts, as well you've learned the important part of timing which can be figured out with what gear you have and location you're shooting at. Check the index.
This post is why I shoot the way I shoot on natural light and recommend anyone in my situation, such as lack funding for assistants, don't have friends/family willing to help consistently on a bunch of natural light portrait shoots, and don't feel comfortable with any lighting equipment/modifiers in the field by themselves while you shoot. I know most others teach to have a fill, reflector, or something but this isn't doable alone (just you and a model/person), especially in a big city where tons of people pass by, or even small cities if you're paranoid like me. So the following will help you in this same situation to still create unique and amazing natural light portrait shots.
When I say easy, it can be very easy if the sky is very consistent in cloud coverage (large cloud coverage) so you have constant and consistent giant softbox type of light during your time shooting outside. Such as for example on my day shooting outdoors on Halloween 2015.
Assuming you already have the basics down. But the compositions of what I prefer are leading lines, sometimes repetition when possible, and one of my favorites... rules of third. I'll go over this on the location scouting post. Sometimes composition lackluster, so you can either A: move to a better composition/location or B: photograph the subject close enough and with the right lens to bokeh the background much heavier to remove most of the background's composition at least.
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Keep in mind the posts in the index are in order, so if you're jumping in reading the series at 3 or 5 you should really read from 1 to above to ensure you did not miss anything.