Image not displayed

Why is the image on one page is not displayed,
but on other similar pages the images are displayed?

The image is not displayed on the page
http://helenir57.rf.gd/disk47.html

Ok pages:
http://helenir57.rf.gd/disk46.html
http://helenir57.rf.gd/disk48.html

Update:
Firefox 51.0.1

GET /pictures/47.hachaturyan.jpg HTTP/1.1
Host: helenir57.rf.gd
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:51.0) Gecko/20100101 Firefox/51.0
Accept: /
Accept-Language: ru-RU,ru;q=0.8,en-US;q=0.5,en;q=0.3
Accept-Encoding: gzip, deflate
Referer: http://helenir57.rf.gd/disk47.html
Cookie: __test=cb04c980fd77d912181896b958039c77
Connection: keep-alive
Cache-Control: max-age=0

HTTP/1.1 302 Found
Server: nginx
Date: Fri, 10 Mar 2017 10:02:44 GMT
Content-Type: text/html; charset=iso-8859-1
Content-Length: 219
Connection: keep-alive
Location: https://infinityfree.net/errors/403
Cache-Control: max-age=2592000
Expires: Sun, 09 Apr 2017 10:02:44 GMT

The image file is present in the pictures folder and opens in the editor paint.net.

The image file itself looks like, so I suspect it’s caused by the file name triggering a security filter. I tried to copy the file to a different name, which is working fine: http://helenir57.rf.gd/pictures/47-image.jpg

all clear. thank you