Street art: art or not

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Across
  1. 2. the feeling that somebody/something is good or acceptable; a positive opinion of somebody/something
  2. 3. fact or an event in nature or society, especially one that is not fully understood
  3. 6. to show something in a public place for people to enjoy or to give them information
  4. 7. ​not allowed by the law
  5. 8. made of concrete
Down
  1. 1. person who does a job without being paid for it
  2. 4. to separate into parts; to make something separate into parts
  3. 5. strong, hard metal that is made of a mixture of iron and carbon