Yes, the sketches were real but they were not drawn by Sasha Alexander (The Actress who played Special Agent Kate Todd) They were shown as part of a storyline as if they were drawn by Kate but she did not draw them. They were drawn by a professional sketch artist.
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Kate Todd is played by Sasha Alexander, who left the season for personal reasons. Her character, Kate, is an ex-Secret Service agent who was invited to join NCIS by Agent Gibbs after she disobeyed a superior. She did not leave for personal reasons, she died, shot by Ari, Ziva's half-brother.
Yes, NCIS is real.
Yes the NCIS building is real. It is located at the Washington, DC Navy Yard.
Yes, NCIS is a real organisation besides a TV show
Yes the show is based on the Real federal agency