How to remove ID3 audio tag image (or metadata) from mp3 with ffmpeg

I've tried to use codes provided by LordNeckbeard, none of them worked for my case. But this one worked:

ffmpeg -i tagged.mp3 -acodec copy -map 0 -map_metadata 0:s:0 notags.mp3

It shows now only one tag, 'TSSE' (means Encoder).

None of the above worked for me but the following did:

ffmpeg -i tagged.mp3 -write_xing 0 -id3v2_version 0 untagged.mp3

Strip metadata tags and remove album cover image

ffmpeg -i input.mp3 -map 0:a -c:a copy -map_metadata -1 output.mp3

• -map 0:a Includes only audio (omits all images). See FFmpeg Wiki: Map for more details.
• -c:a copy Enables stream copy mode so re-encoding is avoided.
• -map_metadata -1 Omits all metadata.

I tried llogan's solution with a small castle.mp3 file and found out that its size increased from 4448 to 4797 bytes! Further inspection in Audacity revealed that the signal has been slightly "delayed" as well - however the length of the file [castle2.mp3] remained the same.

After that, I used id3v2 -D castle.mp3 to delete all mp3 tags from the file, and the filesize went down to 4320 bytes, with no other noticeable (undesired) changes.