>>6819890>>6819908using firefox(don't know if it's the same for other browsers) -> right click -> inspect element -> search for the link to the image
normally works for all websites
the link you want is:
https://instagram.ftxl1-1.fna.fbcdn.net/t51.2885-15/e35/15877412_749400468545435_1268504035229433856_n.jpg