Once the layout for a piece has been approved, work begins on putting together the commission.  At each stage of work, the commissioner is asked for their input and to approve the progress.  There is still scope to change the initial concept to some extent, either adding to, or slightly changing the composition.  Depending on the media used and the detail included on a piece of work, it may take as few as five stages of approval to many more.

The progress on a piece of work is photographed regularly, with some of these photographs the ones used for approval.  The photographs can be sent to the commissioner once complete, for them to have a record of how their piece was put together.