Connoisseur CAPTCHA

The paintings below are either going for under twenty quid or for over three grand on eBay.
Do you know enough about the world of art valuation to tell the difference?
Links appear after you guess for you to bag any affordable beauties.

Select all squares with
art that costs less than 20 quid
Click verify once there are none left.
The quiz is made using live data from eBay, so may contain glitches.
Amateur art is joyful, and professional art shouldn't be cheap, so enjoy the pictures and don't be snarky.
Gifs via Giphy.
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