Chowdhury keeps a large number of his own sketch books which function as his reference material. From these resources he constantly reworks images, enlarging and distorting the work, whilst simultaneously adding colour and texture to the new image.
"Chowdhury's seemingly out of control outlines, that enclose mottled areas of mouldering flesh etched in a spidery network of cross-hatched lines, and his bodies that bloat and sag as if some genetic code within them had gone mad, are not images that are easy to forget." (Kamala Kapoor, Contemporary Art - Deutsche Bank Bombay, Ahmedabad, 1995, p. 16.)