There was an increased fascination for which types of paintings in the Mewar School in the 18th century?

fascination for portraiture

Answer: An increasing fascination for portraiture
There was an increasing fascination for portraiture in Mewar painting.

Mewar painting in the eighteenth century increasingly became secular and courtly in ambience. Not only an increasing fascination for portraiture emerged but outsized and flamboyant court scenes, hunting expeditions, festivals, zenana activities, sports, etc., were largely favoured as subjects.