@Atropa Belladonna: from what I could tell, what you did before would the following.
[spoiler=image code here] [/spoiler]
Which just put the image in the title section of the spoiler, instead of properly in the spoiler.
But at least you got it working now!
Obviously, you can change the title of the spoilers too, if you haven't already. Just keep the format in mind and it'll be all good =)
♯ Lay on a field of green | with Mother Eve | with Father Pine reaching high | Look at yourself in the eyes of aye-aye | Unfolding rendezvous ♯