Answer:
A viewer likes the style of the work on display but wants something slightly different
Step-by-step explanation:
If the observer in the gallery likes the style of the painter and has the idea of the piece of art that could be done in that style, they could commission the art from the artists.
Someone might not find the certain art displayed in the gallery fitting but does like the manner the artists use to complete their work. They can therefore contact the artist or get in through with them through the gallery, and ask if they can produce the painting, sculpture, or drawing that would be preferred by the observer and the buyer.