To rotate pictures in Writer or Impress, you've to open Draw, insert the pic then copy and paste it in Writer or Impress. This way, the pic is converted to a graphic.
Once the pic is a graphic, you can rotate it and add a shadow: right click, Area, Shadow tab.
Thanks to add '[Solved]' in your first post title (edit button) if your issue has been fixed.
AOO 4.1.3 on Xubuntu 16.10, (Yakkety Yak) and on Windows 7 (with winPenPack port).