Verbal description should include standard information, the artists name, the title of the work, key dates, mediums, dimensions, nationality of the artist, giving the viewer/buyer, quick, relevant, facts that they can easily recall.
Invoices should contain information about: you the artist. your billing address. your client or customer. ​their taxable address. your tax reference code (UTR - unique tax reference code if in the UK) the tax date for the product or service rendered. description of the artwork provided or artistic service rendered.
Artist's Bill of Sale Date of sale and invoice number. Invoice numbers can be used as a unique reference ID and will prove very helpful should you need to quickly find the documentation later. Artist's contact information. Buyer's contact information. Artwork sold. Subtotal. Taxes. Other charges. Total.