by ДиБгд, via WikimediaA life-restoration of the titanosaur ampelosaurus atacis, shown with spiky osteoderms along its spine
by T. Tischler, Australian Age of Dinosaurs Museum of Natural History, via WikimediaLife-restoration of diamentinasaurus matildae, showing one possible level of titanosaurid osteoderm distribution
The monster statted up below is an argentinosaurus, by many estimates the largest of the titanosaurs. I chose to call it, simply, titanosaur, a rather generic name which can cover many species (including the horse-sized magyarosaurus). Identifying this monster by its scientific clade is akin to naming the stat block for tyrannosaurus 'coelurosaur'. Still, I thought it was better than identifying it with the real-world nation of Argentina, or calling it 'titanosaurus', which, despite lending its name to the titanosaurids, is a much smaller titanosaur than argentinosaurus (13 tons compared to argentinosaurus' 70-100 tons) and is now usually considered to be a nomen dubium - a name or classification unsupported by current science.
Also, it is important to remember that paleoart is often minimalist, omitting many potential features of a dinosaur that are not preserved in the fossil record. More adventurous paleoartists like to go out on a limb with their reconstructions, giving them interesting features that, while not necessarily supported by the fossil record, are also not disproven by the fossil record and thus may rest within the realm of possibility (I call this the Air Bud approach to paleoart, i.e. "There's no rule saying dogs can't play basketball"). This type of paleoart emphasizes naturalism, showing prehistoric animals in all the variety of coloration, integument, and behavior as other animals we are more familiar with. This often breathes new life into depictions of prehistoric animals, and generates renewed public interest in paleoart. With that in mind, here is another titanosaur illustration that would certainly make an impression in a fantasy world.
by Danny Cicchetti, via WikimediaA be-striped, be-quilled, and be-dewlapped life-restoration of the titanosaur overosaurus paradasorum