If you want pictures one thing you can do is go to
http://en.seedfinder.eu/ It is a database with 2128 different cannabis varieties. 1879 of them from 122 established breeders - linked and expanded with 77 pure local breeds, 26 clone-only strains and 146 various unknown or legendary varieties listed so far, and the list keeps growing. Some of the older strains do not have pictures but when you click on a strain it brings up what was the breeder information for the strain and for many there is the picture the breeder chose to use when they were advertising their strain.
You can always copy those pictures, and some or all the strain info too, like if a cross, there is a list of all the various strains that went into the making of the cross.
You can find most of what you will need there and after that all I can say is Google each strain you have not by then found pictures for and with luck you will find suitable pictures.