Lots of talk but little substance. The pics certainly look like dinosaurs. Sure, some are blurry. Some may even be forgeries, but the fact is there are depictions here that look just like dinosaurs along with written accounts.
Simply claiming they must be forgeries is not an argument, but that seems to be what you guys are doing here.
Btw, the depictions from the Indians of the reptilian bird of great length is probably accurate as the Indians in the southwest had "legends" or accounts of such a creature, depending on how you want to look at it.
As far as more obvious myths on dragons having exotic qualities, the same goes often for more mundane creatures like bears. There are myths of animals we know existing having exotic qualities in certain myths, but the creatures are still real. They were just exagerrated.
Dismissing all of the accounts of large reptiles (dinosaurs) a priori seems closeminded to me.