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All answers having "Work of art" as clue:

3 Character Answers:

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GEM

NIT

OIL



4 Character Answers:

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EPIC

ICON

NUDE

OPUS

POEM

UNIT



5 Character Answers:

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MURAL

PIECE

PIETA



6 Character Answers:

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DESIGN

OEUVRE

TEETER



7 Character Answers:

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STABILE



8 Character Answers:

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MONALISA

PAINTING



9 Character Answers:

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SCULPTURE



11 Character Answers:

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COMPOSITION

OILPAINTING