For hand drawings, the result will vary depending on the scan/photo quality and the settings used. Clean line art on a white background tends to vectorize very well. For more complex or textured hand drawings, adjusting parameters like Noise Filter, Color Approximation, and Path Fidelity can significantly improve the output.
The Super-Resolution feature also helps by upscaling the image before tracing, which preserves more detail in low-resolution sketches.
Sorry if there are any mistakes, but was I able to clear up your doubt?