I suppose the title explains the problem. Is this possible? I am planning on having a lot of pictures at my page and I am worried it will not have enough space for that. Therefore I am thinking of finding a host that only will be used for my images/photos. So is it possible for uploading a .htaccess script on the "photo database page" that allows my main site to hotlink the images, but still will refuse other pages to use them directly?

I barely have any experience with such things.

Do you have cPanel? cPanel should have that feature to do that for you.

(Sorry for a late response.)

Yes, I have cPanel. ;) Though I am not very good with it so I have no idea how I can do that?

Create the following .htaccess file where you will host your images

RewriteEngine on
RewriteCond %{HTTP_REFERER} !^http://www.domain_allowed.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.domain_allowed.com$ [NC]
RewriteCond %{HTTP_REFERER} !^http://domain_allowed.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://domain_allowed.com$ [NC]
RewriteRule .*\.(jpg|jpeg|gif|png|bmp)$ - [F,NC]