I love stills because they are rather inexpensive and can easily be stored in a binder. I use clear plastic top loading sheets to store 2 stills in each. I used to arrange them in film sequence order, but that became too hard the more I bought. Most are 8"x10" in size, though lobbies also came in 11x14 in size for larger display.
It was fun to collect stills and lobby cards from different countries. Italy had a unique color printing effect that was glorious, especially for Hello Dolly. They are very beautiful.
I have been scanning my binders and have many done from the early films. I will continue to scan and share my many stills on my website www.ilovebarbra.com for you to check out.
I have yet to count my stills up, but they are in the hundreds, possibly more. I should go through the binders more often because they are really fun to look at. I also try to get pics that have themes, like Barbra wearing blue jeans (not that common) or pics of Barbra holding a microphone, a little more common, but come from the category of Candids and not necessarily movie stills.
Here is a small gallery of some of my favorite Streisand movie stills from Funny Girl, Hello Dolly and The Main Event. What for more! Enjoy!