What tools to use?

[poehalcho]

some of you may have seen it, some may not. some time ago I drew this image

Spoiler!

anyway. I'm not done with this project yet. right now I wish to go over the lines again, this time turning them into good sharp/hard lines. I'm not really sure what the best way would be to go over it. Should I use vectors? or something else. How can I make it look kind of rough, but less sketchy than it is now?

[Deadsolid]

You could try paths with custom brushes.

[0l3n]

What DS said, pentool + a custom brush.

[poehalcho]

any specific brush one might recommend?

[Deadsolid]

To be honest, you could try the hard round brushes. Or make a square brush.

[dom]

Illustrator (what you're asking is basically what it was built for)