In today’s world where we post pictures of ourselves and pretty much everything around us there is the known risk of people being able to track you by the EXIF data with GeoTagging. But now a picture’s location can be determined by purely the image itself. No metadata needed.
There are many other things that can be a bad idea to take pictures of in your daily life. Namely, make sure you do not go on a live cam or take a picture with identifying information about you in it. Something such as a credit card could leave you exposed to a lot of grief.
NEVER have your keys of any kind in pictures since they are easily duplicated from an image.
It may also be a bad idea to have your fingerprints in high-res images. No one has come out admitting to the technology but the same that applies to facial recognition could soon, if not already identify you even more than just the facial recognition. Some “hackers” have shown it possible in a very time consuming manner but it is a proof of concept that is over a year old. By taking a “selfie” today you may be adding yourself to a massive database tomorrow. The technology is already being used widely.
Your image could be posted in many cases with no knowledge that a photo was even taken by you. I have seen myself in photos on Yelp where I happened to be in the restaurant when some stranger was taking a picture to post with their review. So at the time without my even knowing I was geotagged there. So between my own posting of images, strangers, public/private video cameras and the information my phone may leak I can go back in time and track my own movements.