Changing the title, which it turn changes the URL means that any links you have on any other web pages to your image will no longer work, they will be broken links.
So, people may find a page that you have put your link on, but when they click it, they will just be given a 404 page not found.
Same with if you have linked your image on any post on Social networks, like FB, Twitter, Pinterest etc.
Also, Google web and also image results will be invalid, as the URL doesnt exist any more, and you will have to wait until Google re-indexes your page. (Or if you submit it yourself)
So, IMO, generally it a bad thing to do for SEO and links.