As far as I can tell, nothing. I know the one up Mount Coronet shatters after you have freed Azelf, Uxie and Mesprit, but...who knows?
I also know what the painting signifies. The three markings forming the triangle represent Azelf, Uxie and Mesprit. The glowing sphere in the centre represents Dialga, Palkia or Giratina (depending on whether you're playing Diamond, Pearl or Platinum).
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The painting in the celestic town is a part of the game that allows you to advance to a new level. Once you acquire the painting and the pearl, you can then go on to beat other levels.
i don't know but it has to do with the 3 Pokemon UXIE MESPRIT and AZELF and DIALGA
therr is no ancient painting in MT. Coronet, there is one in celestic town but it cant be destroyed...
in the celestic tow cave in the center of the town
im pretty sure you dont. if you are looking for palkia dialga or giratina theyre at the top of mount, coronet.