I opened it on photoshop, replicated it and then adjusted the threshold to get the outline of the image. After this I filled it in and neatened up the edges using the paintbrush tool.
After having done this i opened Adobe Illustrator and opened my completely black image.
I then clicked 'live trace' then 'simple trace' and then 'expand.' This then allowed me to neaten up the edges by using the pen tool and the direct selection tool.
After this, I placed my detailed image on top and experimented with different colours.