Trace Line Drawings

Very simple project, I have some images that I need the outlines drawn over 4 times each. There will be 10 images that need this done on.
Each image should be delivered on white or alpha, ideally as a png but can also accept jpg.
I will show you some test work we have completed previously and will check with you after the first image to make sure you are on the right track, this should eliminate the need for retakes.
Many thanks