I actually like this style a lot. Just pen, not pencil. No base, no erase. It's kinda messy. You could tell where I messed up XD
But maybe after more practice I can get the hang of it.
The materials I used was one pen, the pen is a measure '03' and the type is the Prismacolor Premier pen set. There's 5 in a set.
I did good for a beginner. But that's just my opinion.