> When I handed in my first commissioned piece of work, the art director asked if I had brought along an invoice. I confessed to having no idea what an invoice was or what I needed to say on it. She very kindly took a piece of blank paper and showed me where to write my address, where to put the magazine’s address, what I had to say on it, where I put the amount and where I numbered the invoice. She then duly photocopied it and gave me the copy, retaining the original, which she sent to the ...

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