Image trace not producing clear image


Hi Everyone,
I'm trying to use image trace to vectorize an illustration. The first image above is an illustration done with marker. The second image (the image on the right) is what happens after I apply image trace. I'm not sure why the image looks so jagged/un-even. I've tried to play around with the advanced settings, but updating the noise and some of the other features doesn't seem to make much of a difference.
Does anyone know what I'm doing wrong? I'm new to Illustrator--so it might be something obvious!
Thanks for the help!
