If you have the space, why would the number of pictures be a problem? Just disable directory view in your webserver and it should just be able to handle it.
But I have no problems with space or bandwidth. The limit is on the number of files I can have on the server. Right now I can have around 600k files, a very comfortable number for the next months/years. You know that hosting services talk about unlimited, but there is always some kind of limit. I preferred to have unlimited disk space and bandwidth.
So entering 800k files now would require a new server upgrade. And I didn't want to do that now. But, I'm checking several options that can make everything viable, without having to do a new upgrade. Therefore, what I ask now is patience to be able to support this type of action. I am studying what I can do to accommodate these images.