My "secret" is to come up with some good-enough search terms, usually by trial and error, that lead me to some search results that give the next search terms to use to "home in" on the relevant information.
For example, that tomahawk has an prominent eagle on the head, and looks like it's made of brass. My first search on Google was for:
brass tomahawk eagle
...and then I went to the images page to quickly look over the results. I didn't see anything promising, so I then tried a search for:
bronze tomahawk eagle
...and there was an image result that looked similar, which mentioned the "Improved Order of Red Men", so my next search was for:
"Improved Order of Red Men" tomahawk
...which led me to one of the images I posted from Worthpoint (along with the description).
Doing the same search ("Improved Order of Red Men" tomahawk) on the Worthpoint site led me to the other example I posted.
And that's it!