You believe that hundreds of dinosaur depictions from geographically diverse areas over thousands of years were the result of dinosaur bone excavations? Where is the evidence for this? Or, is this another "just so" propaganda story? How did the ancient artists know how to correctly draw dermal patters and cartridge frills that have only been recently been authenticated?
For example, Luis Chiappe and colleagues discussed certain sauropod dinosaur embryos found in South America: “The general skin pattern consists of round, non-overlapping, tubercle-like scales…A rosette pattern of scales is present in PVPH-130″ (Chiappe, et al., 1998, p. 259). Note the skin depictions above to the right. “Both taxa show a round pattern of small polygonal scales, which in some places is interrupted by larger oval tubercles surrounded by the small scales, resulting in rosette-like structures. …which also match the most common textures known in dinosaurs.” (Christiansen, and Tschopp, “Exceptional Stegosaur Integument Impressions from the Upper Jurassic Morrison Formation of Wyoming,” Swiss Journal of Geosciences 103:2, 2010.)
Authenticated Ica Stone (with lines highlighted)
Other items of anatomical accuracy that attest to the authenticity of these Ica Stone depictions include the positioning of the tail and legs. Early critics said the Ica Stones were fakes, in part because their tails were almost all sticking out while walking. Paleontologists in the 1960s were confident that dinosaurs dragged their tails. The paleontologists were wrong and the Ica Stones were right. 
Scientists now believe dinosaurs held their massive tails off the ground while walking, because there are no drag marks on dinosaur trackways. The dinosaurs on the Ica Stones are accurately depicted standing upright, rather than with legs splayed out in a lizard-like position. The stylizing of animals depicted on the Ica Stones matches those found in the Nascan Lines (monkey with curled tail, hummingbird, and stylized dinosaur). 
Many of the Ica Stones were been blackened so that the artistic etchings stand out. Undoubtedly, many fraudulent Ica Stones have been manufactured over the years to sell to tourists. But dinosaur stones were found in tomb excavations by experienced archaeologists. Moreover microscopic analysis of the patina (covering the stone surface), copper traces and oxidation in the etching grooves helps distinguish between the authentic and the recently forged artifacts. In 2015-2016 Genesis Park participated in research seeking a methodology to independently authenticate the Ica Stones. This resulted in an article published in a peer-reviewed creation science journal.
