You have a contemporary 20th century Susan Herbert image that is a 'spoof' or fantasy image based on "Lady Elizabeth Delme and her Children" by Sir Joshua Reynolds (1723-1792). Herbert generally keeps the originals and has the image copied by print or giclee. Yours may be a framed giclee and depending on size, can sell for $40 - $100. She is known for re-imagining many historically famous paintings with cats in the roles of the main sitters instead.
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Here is a link for you to a matching color lithograph print by her, measuring 8.5" x 10" that sold for $48:
Here is a link for you of the same image depicted on a candy tin from 1990 that sold for $19.99:
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