What form of art did younger painters in Mumbai specifically use to express their inspiration after being inspired by Baroda school?

Canvas paintings

Answer: Canvas paintings
The passage mentions that younger painters in Mumbai went to the extent of using photographic images on canvas.

Taking a clue from Bhupen Khakhar’s bold move and the Baroda artists’ celebration of popular art, younger painters in Mumbai found inspiration in popular images on calendars, in advertisements and film hoardings. These painters went to the extent of using photographic images on canvas. This style is different from what we have seen so far. It is not modern in the same sense. It relies on double meanings and experimental technique, in which watercolour is painted in the style of a photograph.