Just degrease them well with alcohol after removing all labels (oil can be helpful for this purpose),
and then paint them with acrylic paint.
Spray fixative as a final hand to give shine to the surface and protect the paint.
Easy and cheap!
If you are not skilled draughtsmen it will be better to perform the drawing on the proper size paper,
paint an opaque background, then apply the colored copy paper, fix it with duct tape, then fix also over the picture and go on with the tracing.
Then we can paint our picture as we want: easier to do than to explain!
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