Editing a Scanned Image

So I'm currently an Art Major in school, and I've been studying examples from the Art Nouveau era. I've been sketching out symmetrical designs, scanning them and mirroring them on Photoshop.

All has gone well so far, however, I'm now trying to figure out how to clean it up and make it look "perfect". In terms of being perfect, I want it to look completely clean. I darkened the lines as much as I could and erased as much as I could, however, I've tried different things such as blurring, sharpening, and adjusting levels, but the lines still seem too jagged from the sketching. I'm wanting to smooth them out and make them look nice.

Here is my drawing:


and here is an example of what I would like it to look like(minus the completely filled in black part)

You see how crisp it is? No jagged edges, completely smooth and clean. This is what I want.

So does anyone know of any ways to get to this result? Help is very much appreciated, thank you!

I think you need to make a mask of the outlines of your drawing and then fill from there - will see if I can find tutorial.

As you said, you have touched up your scan, but not apply any effects to the lines.

The second image is vector based.
The only way is by tracing. I do it all the time, but is a hard job.
Here's my 5 minute work on your image, not perfect but nice.