I'm just wondering if it possible without the given options.

You don't. Unless it is a reason that is given, don't flag it.
If the post needs administrative attention(eg: to settle tag wars, or if the post contains something other than the image such as a embedded zip file), use the report post option instead.

Chaser said:
You don't. Unless it is a reason that is given, don't flag it.
If the post needs administrative attention(eg: to settle tag wars, or if the post contains something other than the image such as a embedded zip file), use the report post option instead.

I want to flag a post for not belonging on the site.

Dutchnoob said:
I want to flag a post for not belonging on the site.

you are still not supposed to flag it. its up to admins to decide what belongs and what doesnt.

Dutchnoob said:
I want to flag a post for not belonging on the site.

If it's approved and you still have your doubts, you can always politely bring it up with an admin later-- mistakes do happen, after all.

...Just keep in mind that in that case, you're drawing the actions of someone into doubt. :) So be nice about it!