It takes a long time to illustrate something from scratch. I sketch and correct my lines, and keep sketching until I get the design in a place I like. To save on time, as soon as I have a design I like, I make a tracing of it. Then, to make the transfer process as seamless as possible, I take 5 steps.
Cover the back of the tracing with graphite:
Tape that sucker down to the final paper so it doesn't slide around:
Begin tracing the lovely illustration:
Check traced lines and double check placement by lifting occasionally (thank you, tape!):
Keep tracing until piece is finished:
This post will also be going up on the How-To page for easy reference.