Final look of postcards

I have decided on the final look of my guardian postcards. They will each be 2 colour - black and the colour which their packet is. This will ensure there is continuity and they will look like they're meant to be together. Also from a print perspective it would probably be cheaper than four colour process, although with four packets that means if i were to use spot colours there would be four colours plus black so i dont actually know if it would be cheaper. but it makes them simple and therefore hopefully easier to understand as a communication.
I produced the images by drawing (ok tracing) the objects i wanted in the image, then i scanned them in and vectorised them so i could then live paint them. i had created one of them initially on illustrator to see what it looked like but it didn't look fluid enough, this is why i chose to do it this way.