This suggestion is more geared toward new users, but could also be used for users who have lost certain rights.
I think making the picture and youtube click-able links unavailable for users under 15 posts would be a good idea. (In posts, sigs, ect.)
This could also be used on members who have lost rights due to warn, ect.
Would avoid a lot of confusion.

If possible they could be greyed out, maybe even a tool tip explaining why, if this is possible.

Example:

I like it. Voting Yes also.

Excellent idea. Would greatly reduce confusion and new threads asking why they can't post images.

Voted yes.

Thanks for the replies guys.
Bumpity.

Yes.

This would aid in informing new users on why they are rendered unable to post their images when they first join.

Voted yes. Good thought, Mike.

Yes

Yes sir, I like your suggestion
Mike for president

Le bump.