I haven’t used mock-ups much in showing my art, but realize it gives the viewer (client) an idea of how the piece of artwork might look in different settings/contexts or living spaces. A mock-up is also useful to give an idea of the size of the artwork and how it will enhance a room as most of us have difficulty visualizing how a piece might look.
The dresser mockup was created by a talented artist friend of mine, Marius.
And…. one of the main elements for an impressive portfolio is the visual presentation of your project.