Concept:
The Mewar School of Painting is an important school of Rajasthani painting.
It flourished in the Mewar region and produced many famous artists and illustrated manuscripts.
Step 1: Understand Mewar painting.
Mewar painting is known for bold colours, religious themes, court scenes, and illustrations of epics and devotional literature.
Step 2: Check the artists.
Sahibdin is strongly associated with the Mewar School of Painting.
Madho Das and Jagannath are also connected with the Mewar tradition.
Manohar, however, is more closely associated with Mughal painting rather than the Mewar School.
Step 3: Final conclusion.
Thus, the artist who does not belong to the Mewar School of Painting is:
\[
\boxed{\text{Manohar}}
\]