Can't get the right results with bitmap tracer

[herbiehysteria]

Hi guys, I have a clear black and white bitmap which I am trying to vectorise using the bitmap tracer tool under utiilities, i have tried tweaking the settings to so many different combinations but it still traces it with jagged edges and it's not very 'clean' as opposed to the original image. it's a black and white drawing with definitive shapes. can anyone recommend the ideal settings to get it looking at least 'close' to a normal vector?

Thanks