Cryptic crossword No 3,688

Across

1. Turner made progress between one piece and another  (8)
2. New pupil that is receiving training of Titian (8)
3. Bacon’s bold brushstrokes ultimately capture our former monarch (7)
4. Hopper for one is favoured by faction (6)
5. George playing on harp unexpectedly provides subject for Vermeer  (10)
6. El Greco for instance is obsessive about the essential character of art  (5)
7. At the edges, Bosch includes part of canal, river and fortification   (10)
8. A little Canaletto soon in works accepted as genuine (5)
9. Pollock, for example, is member of a school    (4)
10. Squire obtains frame of large Constable (6)
11. Crazy about face of Nicholson's Cockney girl? She's a beauty! (7)
12. Eruptions of opponents. claiming Emin has no substance (4)
13. Press case for National Gallery to hold first showing of Caravaggio – it's priority (7)
14. Mythical beast in pictures including Hokusai's first one shown abroad (7)

Down

1. Claude Monet’s inner genius  (5)
2. First impression of Dali is a stubborn person - it's deliberate! (7)
3. Words of introduction Lamb deployed with peer (8)
4. Seurat quirkily captures the essence of country walk (7)
5. Contract for Freud? (6)
6. Retire in Toulouse-Lautrec's boarding house on vacation (7,3)
7. Escher frequently holds head up, showing spirit   (7)
8. Degas, almost having flipped over finishing touches of picture, becomes satisfied  (6)
9. Klee's head drops in Staffordshire town (4)
10. Whistler's helper is welcomed in Dakar excitedly, being an African native   (8)
11. Munch's retained by salesmen for further showings (7)
12. What Hirst changed into?  (5)
13. Picture of drunk possesses a touch of Hogarth (4)
14. From the outset, Stubbs tries being dominant over horse that's resisting (10)