Earlier quoted context omitted.
I would caution that artwork is only 'solved' with relatively simple text prompts. To create a novel painting with a precise mix of elements that would take a paragraph or more to explain is still tough, though DALL-E 2 does seem like a big step towards that.
Sam seems to be demoing something fairly close on twitter. https://twitter.com/sama/status/1511724264629678084 The solar powered ship with a propeller sailing under the golden gate bridge during sunset with dolphins jumping around was pretty impressive. https://twitter.com/sama/status/1511731259319349251 I think it's only missing the dolphins.
As a tool, this could be used by an artist to continue working on that image until it's exactly what the artist (or the comissioner) is looking for: masking off the water to actually add dolphins, masking off the ship to redraw it, retoning the sky for a more aesthetically-pleasing sunset, adding other objects to specific locations in the scene, etc.
Here's one example of how these composite prompts + masking can make more specific images here: https://twitter.com/jmhessel/status/1511757848442654721