RFR: Adding some new Duke images

[Jeff Dinkins]

Some 3D Dukes and a Duchess

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Commit messages:
 - Adding some new Duke images

Changes: https://git.openjdk.org/duke/pull/4/files
  Webrev: https://webrevs.openjdk.org/?repo=duke&pr=4&range=00
  Stats: 0 lines in 4 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/duke/pull/4.diff
  Fetch: git fetch https://git.openjdk.org/duke.git pull/4/head:pull/4

PR: https://git.openjdk.org/duke/pull/4