Firstly, you should not wear your hair pulled back as this gives an impression that you have a big face and you should go for hairstyles that frame the face instead.
Go for straight hair as the linear style not only draw attention away from a plump face but elongates it as well.
Secondly, you can try to use make-up to add shadow and contours to the face. This makes you seem to have prominent cheekbones which tend to give the illusion of a slimmer face.
To look natural, you should avoid the hard-edged sculpting and contouring that is typical of make-up from the 80’s.
What you wear also makes a huge difference. Pick a top that shows off more skin which tricks the viewer that you have a longer neck and veers away from the impression of a rounder face. Recommended tops include V-necks and collared shirts with the first two buttons undone.
When it comes to taking photographs, you should avoid frontal shots especially if your face is broad. Profile shots is very flattering indeed. If you look at Hollywood celebrities pose on the red carpet, you’ll notice this style of photo shoot. You want to angle your head slightly, aligning the tip of your chin with your collarbone and what the camera sees are cheekbones and a sharper jawline.