I'm not an artist. I'm more like a cartoonist. But I haven't even done that for a while.
So I bought some stuff to try out. Except I've discovered that "liquid pencils" really aren't very good. They aren't very consistent and seem to fail to make any kind of mark at all some of the time. I mean, the technique on this sketch isn't very good, but I think you can tell it's not just the artist who is at fault.