I’m very tempted to agree with you: people who draw from description draw unicorns after being told about rhinoceroses. We have a lot of medieval monks’ drawings of elephants by description and theirs look like tapir with a trumpet stuck in their nose. This is not a photo, of course but it mainly highlights the head, like any one would if they didn’t measured proportions carefully.

There has also been debate about which species of elephant Hannibal's forces used. Elsewhere, Hellenistic Greek forces used Asian elephants, but many believe Hannibal used North African elephants, a sub-species that was extirpated by the Romans. Their proportions might have been a little different than living elephants. It will be interesting to see if the bone can help settle this debate.