There are a few reasons why your images might not display in the web browser. Below is a outline of things that you can try to get this issue resolved.

1. Check that you have uploaded the images in BINARY mode instead of ASCII
2. Check your .htaccess file within the /public_html/ folder that there is no code within it that looks like this:

   RewriteEngine On
   RewriteCond %{REQUEST_FILENAME} -f
   RewriteRule \.(gif|jpeg|jpg|png|bmp)$ index.php [QSA,NC]

Above are the main issues that come up from time to time with certain software. We strongly recommend that you rename your .htaccess file before you try any other updates.