There are 20 New South Wales prisons with a total of 199 volumes containing details of over 46,000 prisoners. Best of all there is a searchable index.
The website tells us that the records consist of:
"The Gaol Photographic Description Books contain a photograph of each prisoner and the following information: number, prisoners' name, aliases, date when portrait was taken, native place, year of birth, details of arrival in the colony - ship and year of arrival, trade or occupation, religion, standard of education, height, weight (on committal, on discharge), colour of hair, colour of eyes, marks or special features, number of previous portrait, where and when tried, offence, sentence, remarks, and details of previous convictions (where and when, offence and sentence). "Thanks to the headsup from 46,000 New South Wales Mugshots 1870-1930 Go Online