Round face. Is there a chance to make it look a little thinner by injecting some fillers? I also have a double chin (Photos)

Yes, cosmetic fillers can be used to enhance the contours of your facial features. This is best done with firm fillers, such as Radiesse or Sculptra. The goal is to improve the definition of the face without making the face round or puffy. Kybella may also be beneficial to lessen the under chin fat (double chin). To get the best outcome, it is always best to select a dedicated injectable specialist whose sole focus is on facial injectables.

Thank you for
your question ellyraluca. Fillers are used to
restore lost volume in and enhance the appearance of the face. Fillers such as Voluma can be placed in the upper cheeks to restore lost volume in the area. This will also pull up on the lower face to improve jawline definition. Kybella can be used to address the double chin. Please
consult with a doctor for specific recommendations.  Good luck!

If you are concerned about your chin, I recommend that you look into Kybella. 
Injectables wont make your face look thinner per say, but getting fillers in your cheeks might give your face a more contoured look.