For some reason or accidental coincidence, the image was blocked. If you want to see this picture on the site again, then the ban must be canceled. The procedure differs depending on the browser.
Make sure that you have not turned off the display of all images. Check if you can see other pictures.
Unblock the image in Mozilla Firefox browser. Find the "Tools" item in the menu. Select "Settings" from the drop-down list. Go to the "Content" tab in the window that opens. Look for the check mark next to the "Automatically download images" line. Click the "Exceptions" button next to this line. Select the required site and remove it from the list of exclusions.
Unlock image in Opera browser. Select "Tools" from the menu. Hover in the drop-down list on the line "Advanced". Select next "Content to be blocked …". Find and highlight the blocked item or site. Remove it from the list.
Delete the blocking pattern in the Google Chrome browser. Find and click on the wrench-shaped menu icon located in the upper right corner. Select the "Parameters" line in the drop-down list. In the "Settings" tab that opens, go to the "Advanced" item. Select the "Content settings …" button in the "Personal data" section. Find the "Pictures" block. Make sure images are shown and click the Manage Exceptions … button. Find the blocking template under which the required image falls in the list, select it and delete.
Check if you are using extensions that block ad elements, including unwanted images. Find a list of templates for which the content of the page is denied to display, or a list of the blocked images themselves. Select an extra template or the picture you need and remove it from the list.
Consider, for example, one of the versions of AdBlock in the Opera browser. Select "Tools" from the menu. Hover in the drop-down list on the line "Extensions". Select "Manage extensions" next. Find Opera AdBlock in the Extensions tab that opens. Click the button to the right of the label and select "Settings". Check the Personal List tab and other settings.