Nawash started off by achieving a BA (Hons), with distinction, from the Accademia di Belle Art in Rome, in 1964. ​In 1970, Nawash furthered his education in art, receiving three more diplomas in etching, lithography, ceramics and restoration from the School of Fine Arts in Bordeaux, the National School of Fine Arts in Paris, and a short course in Florence.

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Since 1964, Nawash has held numerous solo exhibitions in Rome, Paris, Jerusalem, Baghdad, and Amman and has participated in a large number of group exhibitions in Jordan and abroad.