The image isn't loading for me, all I see is the prompt used to generate it - which is genuinely preferable.
I guess the web server was temporarily overwhelmed by traffic resulting in images (like for you) and css files (like for me) not being consistently served to all visitors.
The blog is running on a Mac Mini on a 1Gb/s uplink so when it gets hit with a front page HN post, it does creak a little but I try to be environmentally responsible with my technology (as much as possible) so I am not in a hurry to move it into a datacentre when currently it only pulls 15-25W from the wall during peak traffic.