Once you have a good quality pixel image, you have three options for this:
- some sort of half-toning — screen off the image and use a tool such as: Halftone generator on Cutrocket — it might be that you could make multiple files, each for different colours
- auto-tracing: Carbide Create - Image Tracing
- placing the pixel image on a background and re-drawing it by hand: Let's Make a B (for anyone) and Carbide Create re-drawing and Importing a file or a backgound image
It’s sort of possible to re-work an auto-traced image, but that is negative fun and tedium — once, when I was much younger a box of watches was sent to my workplace and I spent a week re-drawing them so as to make the base for a point-of-presence display which would fit over a pallet (the assumption had been that having the drawing done by a production person would be less than having a professional illustrator or photographer do it) — a week’s worth of drawing and auto-tracing, and re-working auto-tracing later we had an image which ultimately was included in that watch company’s annual stock report, but the next year they sent in photographs.
Might be that you could have someone re-draw it via a service such as Fiverr