it looks to me that you will have to increase chmod values to the pics ... linking should be fine
unless you have your public_html dir somewhere else than root of the site http://18.104.22.168/
i ussually do it that way
chmod -R 777 *
(here somewhere at least)
if it works i start to downgrade
first step is (allways) others = 0
if it stops working, change ...
i have seen server configs, that did't run if you didn't chmod pics to 770 or even 775 ...
happy, merry ... stuff ...