All Pictures are free to use without any charges, private, as well commercial. The only condition of usage is to
add copyright information to the picture: ©"year of usage" Jonas Looser (e.g. ©2017 Jonas Looser).
Please note that the picture files are in original size, which means those files get pretty large (20+ MB). Think about your mobile data usage before opening an image and remember to download it for further usage.