Feel free to use my photos without permission but please include a link to my flickr page. That way it helps me out too.
<a href="//www.flickr.com/people/34302763@N07" class="extiw" title="flickruser:34302763@N07">Edward Morgan</a>
CC BY-SA 2.0
<a href="//commons.wikimedia.org/wiki/Flickr" class="mw-redirect" title="Flickr">Flickr</a>: <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/34302763@N07/3437784107">Mutt</a>