Not sure there is a much bigger picture. If you look closely there are a lot of artifacts around the woman's silhouette, and they don't look like coming from JPEG compression. That means they could be the result of the image editing, and if there are visible in an image that size, the original wasn't much bigger (otherwise scaling down from a significantly bigger picture would have made them hardly noticeable).
PS: by the way this is mage is likely copyrighted, so using it on a professional sign could be a bad idea.
PS: by the way this is mage is likely copyrighted, so using it on a professional sign could be a bad idea.