How to Prevent Smudging Your Work
by Tracey
The best way not to smudge your work is to not lean on it or you can just do the outline of your drawing lightly before going thick or your work will definitely smudge.
Well, that's the only way I know because I'm 10 years old and I'm a learner, But you don't have to listen to my tips if you don't want to so good luck.
(Thanks Tracey -it's a great tip and in fact I'm always telling students to sketch things lightly first for exactly the reason you've given - Bob.)