Sobral worked in a range of media including painting, graphic design, illustration, scenography and poetry.

[1] His paintings were first shown publicly at the General Exhibitions of Fine Arts (SNBA, Lisbon) immediately after World War II (1939–45).

[2] He joined the Portuguese surrealist group formed by Antônio Maria Lisboa and Cesariny Vasconcelos.

In 1975 he moved to Americana, São Paulo, where he created a sculpture for the city entrance at the invitation of former Mayor Ralph Biasi.

[5] Sobral's monumental sculptures and mural paintings are installed in urban public spaces in Brazil and Portugal.