WHEN people think of modern Indian art, they tend to consider a handful of Mumbai-based artists who have dominated art-world headlines in recent years. This group, which includes Syed Haidar Raza, M.F. Husain, F.N. Souza and Tyeb Mehta, are all members of the extrovert and well-travelled Progressives Group. But interest in Bengal art, which bloomed in the 19th century, is now enjoying a revival that recognises the area's contribution to the development of Indian culture.