Would JPEG be a good format for saving an image of Da Vinci's Vitruvian Man?
Step-by-step reasoning process below:
no
JPEG is not well suited for line drawings and other textual or iconic graphics, where the sharp contrasts between adjacent pixels can cause noticeable artifacts.

Da Vinci's Vitruvian Man is a line drawing done in pen and ink.

.

So, the answer is no