http://cbsr.ucr.edu/
this is a pretty cool site, you can get lost in. It shows newspaper articles from 1800-1900's in the U.S.. If you type in giant skeletons to the searches, there are tons or articles about 7-8ft giants 10-20, 30-40. There are lots in the U.S. Most of the bigger ones in other continents.
It seems to be a common topic in that era. Lots of mounds and stuff being discovered in the U.S. There are rabbit holes with smithsonian coverup of all this stuff I have gone down. Oral histories of some indian tribes have giants. The serpent mounds in ohio.
The painting was made in the 1600's referencing earlier times. It makes me wonder
I saw a dianasaur documentary a few years back where a guy named starlord trains 3 raptors to hunt in a pack and follow his commands. They end up fighting a hybrid dinasaur with the assistant of trex. Maybe these painting guys used dinasaurs for stuff too, haha