Using the airbrush/paintbrush tool draw over your lines. Zoom in (ctl +) to get a closer look at your image and to create a more controlled image.
Ensure that all your lines join up because when you go to all colour, if they are not your colour will bleed into unwanted areas.
Change the density of your line depending on the detail required. E.g I used a finer point (12pt for the vines and a 24pt for the outline. In the top tool bar you can adjust this.
This example is very rushed. I expect your examples to have steadier lines which have been created with greater care and precision.
Using the colour swatch to select your colours.
Select the paint fill bucket. This may be under gradient in your tool section. If so, right click and select paint bucket.
Simply fill in areas with colour.
Save your image AS a Photoshop file in case you want to change the colours.
When printing Save AS a JPG and print multiple images on one page.
Print out your image and cut around your skull. Try and fit as many on one A4 page as possible.
Once your skulls are cut out, apply a thin layer of clag glue to your image.
Paste your image to the inside of the art room windows facing outwards. Please place these at the very top and continue with a line alternating between other students' designs.
The paste up image should be roughly the same size as your actual clay examples.