I suppose if you want to rely on the possibility that someone's mouse happens to hover over the image and the possibility that they happen to notice and say "Oh - it's clickable because I noticed my mouse arrow turned into a finger."

But most people (myself included) will breeze right past it because it simply looks like a static image. It's an inferior and unfamiliar experience (check out how images are treated in the most popular social media platforms). And what if you're on mobile? Perhaps this improvement shouldn't be a priority, but it should DEFINITELY be in the queue.