brush size problem

I drew a character and had to resize it so that it is smaller. Problem is that the smallest brush size is 1 pixel and this is too thick for my smaller character. Is there a way I can draw smaller lines? I think im out of luck here.

What I would do is make the character big, use the 1 pt brush, and then return him to his small size. You can use the drawing select tool and hold shift to make the resizing proportional. For my characters i draw them all oversized and then when they are finished I make them way smaller.