Paintings Clue

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Across
  1. 3. The seven ____
  2. 6. The only paintings left unnamed that fit in the category
  3. 7. Italian Painter of "The Birth of Venus"
Down
  1. 1. Inspiration for a Beatles song named "Dear ____", written while they were studying in India
  2. 2. Not Spiritual, but _____. (Also the name of a common red bird)
  3. 4. ____'s Version; but a Greek philosopher
  4. 5. Batman serves this, but the law can't.