"ln -ln" gives me an error but I guess you meant "ls -ln" which gives me an uid 501 and gid 20 for all the images.
uid=501(mikakylmaniemi) gid=20(staff) groups=20(staff),401(com.apple.access_screensharing),501(access_bpf),12(everyone),33(_appstore),61(localaccounts),79(_appserverusr),80(admin),81(_appserveradm),98(_lpadmin),100(_lpoperator),204(_developer)
Sample from one file:
-rw-rw-rw-@ 1 501 20 8164295 30 Jou 20:47 _MAC8244.jpg