Hi Joejoejoe, hi folks.
A trick I find usefull when tracing over an image is to make sure that I have not enabled "Length snapping" in Preferences --> Model Info --> Units.
In fact, I never use that feature.
This allows more precise placement of endpoints for lines and arcs wich are the tools I use the most for tracing an image. The "Arc" Tool is quite powerfull since you can start a new arc at the end of the preceding one and get a "Tangent" inference to make nice smooth transitions from arc to arc. LAter, I come back and optimise the number of segments to lower the model size. Shallow arcs, usually, can get by with fewer segments.
Just ideas.