Ah, once again, the notifications have failed me.
Clue #1
This time around, there is no pun. Instead, I added three words to the original title.
Clue #2
The alteration turned a two-word title into a five-word title.
Clue #3
I wasn't sure whether to use a clue pertaining to the song itself or to the painting once more, so I'll split the difference here and just make it clear - in case someone had trouble reading it - that the title below is
Finis Gloriae Mundi ... and also, if we look at the original song's guitar solos, there's something you don't see every day.
Clue #4
The title translates to English as The End of Worldly Glory. I know it doesn't sound much like an imperative, but ... maybe it could be one? It's supposed to be didactic, anyway.
Also, just to be sure, the additional three words are all inside, sandwiched between the original title.
Clue #5
The album the original track comes from is rather unique, methinks. In fact,
three of the blokes aren't in the band anymore.
Clue #6
Two of the words I added are only two letters long and the third one is five letters long.
Clue #6.5
The painting is in the tradition of
Memento mori - that is also the significance of the painting's title.
Clue #7
Remember _ _ _ _ _(five letters) _ _(two letters) _ _(two letters) Tomorrow
Also, it is in the title of the painting, but the meaning of the painting is actually scarcely about
glory at all. The word is not one of those added to the title.
Wrong guesses: If Eternity Should Scale // Heaven Can Weigh // Judgement of Defunt // Another Life Has Been Wasted // Prodigal Son of the Miracle // Beds of Death // Prodigal Son Of A Bitch // Infinite Dreams Of The Dead // Phantoms Of The Two Spheras // Death by the End of Glory // We Will Remember Them Tomorrow // Remember The Gates Of Tomorrow // Love Still f***in' Life Here // Remember The World's Glory Tomorrow // Remember of my glory Tomorrow // Remember Us No Death Tomorrow // Remember Death On Us Tomorrow // Remember Mo' Clues Fo' Tomorrow