The ruler seems to be only 5 inches, but then I don't know if you're using the metric system or not. (America just has to be different than eveyone else...:shakehead)
If the scene background was actually dark, there wouldn't be reflections on the globe anyway. Maybe you could throw a protractor in the scene somewhere as geologists use those a lot. But a 3-point light setup would do some good for this scene. (Who thinks up this stuff anyway?)

https://www.3drender.com/light/3point.html

Everything else looks good.