I think for all of us who've created archives of photos of whatever subject(s) we start off collecting everything we can. As we continue to find new images some of the old ones can be replaced with better/sharper/clearer/non-watermarked photos, and if we hit the jackpot, an HQ pic which can be cropped as desired.
I doubt that any of us has started an archive with only pristine pics. Part of the fun, the challenge, and the satisfaction, is not just increasing the range of items covered, but finding better pics for the ones we already have. I'm sure that Gill will agree that it's always a work in progress.
Oh, yes, there is no end to this project.
Every day I either check for the latest engagement & delight in the surprise of HM's combination of outfit and gems, with the added bonus of a wonderful surprise slipped in 2 or 3 times a year. If there are no engagements on a particular day, then I may do a bit of browsing to fill some gaps retrospectively, either online or through some of my book and magazine collection.
I have a "page" for each brooch (M'soft Publisher) with illustrations and history, so when I come across new information on a piece I update the page, with references, as fully as I can. Those fill 2 fat binders....Every now & again I reprint any pages which have changed to keep a hard copy on photo quality paper (luckily I found a store closing down and bought some at a fantastically discounted price!) stored in clear wallet sleeves, with an Index, and all divided up into gem-colour.
I categorise them as
Diamonds - any colour, therefore the Wattle & the Williamson Pink fit here
Blue stones - aquamarines, sapphires and the like
Red stones - rubies, garnets
green stones - emeralds
Purple stones - amethyst
Pearls
Gold
Insigia (military etc)
Mixed stones
Non-gemstone
I also recommend trying to find a recognised and accepted name to use for each one, or a simple descriptive one for the lesser well known ones.
So that's my beginners guide to The Brooches Catalogue (Mine,by the way I actually call "A Brooch for All Seasons") Hope you find it helpful - I just KNOW you are going to have lots of fun (and some frustration too!)