Four modern art maestros from Bangladesh - Shilpacharya Zainul Abedin, Quamrul Hassan, SM Sultan and Safiuddin Ahmed - have elevated the genre to new levels, each through the body of work they left behind during their lifetimes and the audience of modern art needs  more image literacy to fully comprehend the work of the legends, said renowned Bangladeshi art critic Moinuddin Khaled at the 5th edition of Cosmos Art Echo on Wednesday.