What was the image? I don't really delete images on here. Though the last one I recommended on removing was a Twilight vector I didn't want to be posted here on Derpibooru yet.
I did notice your Twilight Sparkle Day pic is missing on here, but it's still on Twibooru. If that's the image you're talking about, then I did not ask to have it deleted. You didn't use any of my vectors. Even if you did, however, I would still allow you to post it. Somebody else did I can only guess.