Ancient Art - A Query

Just about the only art that I know of from Hellenic times has been either preserved on pottery or as sculture.  The Romans later used the technique of designing mosaics, from which we get the famous depiction of Alexander's battle against the Persian army that was preserved in the ruins of Pompeii for so long.  But sources that I've read refer to that mosaic as being based upon an original artwork designed by a Greek artist contemporary to the conqueror.  That work is long gone, of course, but has there been any further evidence of similar artwork being in the historical record?

It would be a great irony if somewhere out there, a lost painting was lying undiscovered in a tomb or cave.  I think that art can tell much about an event or personality of the times and see no reason why ancient peoples wouldn't have used a sheet of linen or papyrus to illustrate a scene from their history as we do with paper today.

sculpture, pottery, and last but not least, architecture.