dotyj :Ive seen that C & C on other Forums too -- I think it means ' Constructive Criticism'
Here is a shot in our local Library taken on my 1966 Carl Zeiss 'Werramatic' I was given he saw me so I call it 'Grumpy Old Man' !

Grumpy by pentaxpete, on Flickr
1/30 at full aperture f2.8 on Carl Zeiss Tessar lens, 2004 outdated 'Boots' ( Fuji) 400 film rated at 200 ASA Epson 1650 flatbed scanner, Vuescan, PhotoShop 7
Just realised -- not quite 'STREET Photography' as he was inside -- more 'Candid'