Prevent hotlinking from httpd.conf with Django

I tried a hundred code snippets without luck. I want to prevent hotlinking to one of my sites. This is the site where I test, if hotlinking is still possible: 93http://altlab.com/hotlinkchecker.php93 This is the link I use for testing: http://www.msc-promotion.de/media/SliderImages/motsi_2.jpg This is my httpd.conf:

ServerRoot "/home/mscpromo/webapps/django/apache2"

LoadModule dir_module        modules/mod_dir.so
LoadModule env_module        modules/mod_env.so
LoadModule log_config_module modules/mod_log_config.so
LoadModule mime_module       modules/mod_mime.so
LoadModule rewrite_module    modules/mod_rewrite.so
LoadModule setenvif_module   modules/mod_setenvif.so
LoadModule wsgi_module       modules/mod_wsgi.so
LoadModule alias_module      modules/mod_alias.so
LoadModule authz_host_module modules/mod_authz_host.so

LogFormat "%{X-Forwarded-For}i %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
CustomLog /home/mscpromo/logs/user/access_django.log combined
ErrorLog /home/mscpromo/logs/user/error_django.log
KeepAlive Off
Listen 57712
MaxSpareThreads 3
MinSpareThreads 1
ServerLimit 1
SetEnvIf X-Forwarded-SSL on HTTPS=1
ThreadsPerChild 5
WSGIDaemonProcess django processes=5 python-path=/home/mscpromo/webapps/django:/home/mscpromo/webapps/django/lib/python2.7 threads=1
WSGIPythonPath /home/mscpromo/webapps/django:/home/mscpromo/webapps/django/lib/python2.7
WSGIScriptAlias / /home/mscpromo/webapps/django/myproject.wsgi

RewriteCond %{HTTP_REFERER} !^$
RewriteCond %{HTTP_REFERER} !www.msc-promotion.de [NC]
RewriteRule \.(gif|jpg|png)$ - [F,NC]

What am I doing wrong?