I made this using a pencil, and i have made other drawings like it, but i never use coleurs as I dont know much about using them. Any clue as to which coleurs would work for this style? any advice would be appreciated
If you wanna preserve your lines, you have to make sure you have a water proof ink. If you use a marker, make sure it's resistant to alchohol.
But looking at your type of art. I think it would benefit on using flat colors so the lines would pop out.