A portrait is often defined with a little depth of field of effect that makes the person in focus really pop. Most smartphones can't produce this effect, but How-To Geek shows off a way to use a single Photoshop effect to create the same look.
How-To Geek suggests using an Iris Blur to emulate the effect of a wide aperture lens. Essentially, you'll apply the effect, then drag the circles around to fake a good portrait effect. Of course, it takes a little more finesse than that, so head over to How-To Geek for their guide.