pictures does not apeare in posts

The correct .htaccess for a multi-site setup looks like this:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]

# uploaded files
RewriteRule ^files/(.+) wp-includes/ms-files.php?file=$1 [L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule . index.php [L]

Note the rule for files: That’s how WordPress locates your images. You need also a blogs.dir directory in your wp-content directory.