(Click to Enlarge.)
A common foible of learning to work in ink is accepting the fact that ink is not pencil. Most of us learn how to draw ("properly") with pencils, so it's the implement that we are most comfortable. Ink is obviously much less forgiving.
I held individual meetings with my 2nd year Cartooning students today and recommended to all of them to keep an Ink Only sketchbook over the summer. No pencil or preparatory drawings allowed. Experimenting with the media in a very pure form will help you learn what is and what is not possible. It's a matter of adaptation and working with the media's strengths. Very zen.
(I actually stole this idea from Sam, who kept an Ink Only sketchbook in the summer between 3rd and 4th year. He improved dramatically. )
This drawing is from a similar sketchbook I'm keeping now, experimenting with washes and painting.