Another question about htaccess

I’ve placed a htaccess in my images folder on the site but when I go to the path on the browser, you can browse all of the images. The rewrite rule is this:

RewriteEngine On
RewriteCond %{HTTP_REFERER} !^https://(www\.)?mysite\.net/ [NC]
RewriteCond %{HTTP_REFERER} !^$
RewriteRule \.(jpe?g|gif|bmp|png)$ images/nohotlink.jpg [L]

The my site has beeen changed accordingly. What am I doing wrong as this really has me stumped. This is a seperate htaccess to the wordpress one. Any suggestion or help would be very appreciated. Sorry to ask but this kind of thing is really new to me.