Scaling the original artwork was already brought up, but the whole point was to make it feel like classic SCUMM. That includes art style. The exaggerated cartoon look, for instance, is one of the things I'd like to see go in a remake like this.
"Booyah! Look out, LeChuck! Here comes Guybrush Threepwood's glowing sword of hot monkey vengeance!"
-Guybrush Threepwood, Tales of Monkey Island