How ‘Low/High’ should low/high fidelity mock ups be?

I've had situations where my low-fidelity mock ups have been 'too basic'. From my knowledge, these are just meant to be a simple sketch on paper or the simplest form of wireframe with placeholders etc without any detail.

When creating a high-fidelity mock up, I tend to make a version as close to the real expected experience as possible as in:

• Correct font
• Quality images
• Explanation of where each link/CTA takes the user to

Are these terms 'low/high' open to some interpretation or is there an expected minimum product when being requested to make these types of mock ups?