I recall seeing a dramatic photograph in a magazine or newspaper of a
man standing dangerously on the exposed bulb of a huge ship's bow,
close to the waterline.

The ship was moving, and I'm reasonably sure the photograph was taken
from directly in front of the ship. The frame would have been filled
by the bows of the ship dwarfing the man, who I believe was protesting
against something. The sides and bows of the ship are most likely
black, and the bulb red.

I'm trying to find out who took the photograph and where I might see
it online or find it. Can you help?

Could it be this:

http://www.indymedia.org.uk/images/2003/01/252103.jpg
from this article:
www.indymedia.org.uk/ en/2003/01/52103.html
Or this:
www.greenpeacesoutheastasia.org/ en/seanews74.html

Thanks for the help, but I'm afraid it's not any of those pictures. It
was definitely someone standing on the bulb, and the ship would have
been larger I believe, possibly an oil tanker?