Step 11 Make sure the shapes are joined (using Cmd/Ctrl + J). Now you can start filling them, using the Eyedropper tool to pick colours from the ‘Posterize’ layer (you may also want to store them in the Swatches panel). If some shapes overlap, copy and select the shapes that need to be divided, then go to the Pathfinder panel (Cmd/Ctrl + Shift + F9) and hit the Divide button. Ungroup them (Cmd/Ctrl + Shift + G) and delete the parts you don’t need. Remember to Group them again afterwards (Cmd/Ctrl + G).

Step 12 Now return to the ‘Contrast’ layer (and the ‘Levels’ layer too, if you created this) – to pick out more details. After this, try playing around with the colours. Using gradients makes the results subtler and gives a pleasing painterly effect.

Step 13 Create a new layer called ‘Background’ and draw a rectangle the size of the document; I’ve made mine dark blue to make the face stand out more. Also draw some simple liquid shapes with the Basic Brush to make the composition more dynamic.

Open the raster.eps file and place the object over the green cap. Select both cap and raster element, duplicate them and drag the result beyond the document edge. Bring it to the front (Cmd/Ctrl + Shift + }) with the raster over the cap. Hit the Crop button in the Pathfinder panel. Align the result over the first raster element (use Smart Guides to help you), then delete the first element. Now you have a rasterised fill giving the cap more texture.