In case this is not legally possible: Fazalmajid grants anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.
This image has currency in it to indicate scale.
Using coins for scale is discouraged as it will require people unfamiliar with them to look up the dimensions or guess, both of which defeat the purpose of the object in the first place. Coins can also reinforce a geographical bias, and some coins' designs are copyrighted.
Ideally, a photograph should include a ruler with the subject (example) or an added scale marking.
SI ("metric") units are the most commonly used worldwide (see meter and centimeter).
Image found on the english project with the following summary: «photo taken by Fazal Majid, 2006-12-02, and hereby placed in the public domain» {{PD-user-w|en|English|Fazalmajid|}}