How many images can I use with the same title keywords?

If you have multiple accounts, you are participating on borrowed time.

For example, will there be any problem with 20 or 30 accounts? Please, does anyone know?

By @Golden Photographer

That's not allowed. You can't have 20 or thirty accounts. If you have ALL your accounts will be suspended.

If you cannot come up with unique titles for your images, perhaps they are just too similar. You most definitely cannot have 20 or 30 accounts.

Why would you do that? Are your assets not different enough to get individual keywords and titles?

The assets you submit to Stock should be unique from other content.

If you have a large series of similar content, submit it to other services.

It's not prohibited.  But it won't help you make more sales.

If all your images have the same title, keywords & descriptions, you're just competing with yourself in searches.  Not smart.

Well, let's put it this way. I recently had three assets removed from my portfolio that had the same keywords. They were of children peeking out from under covers. Also, has recently begun removing images as being "too similar" to other images submitted (even when they are arguably not), and using the same keywords might therefore result in rejections. If your images aren't different enough that the same keywords apply, they might be seen as images that are too similar. In the end, it's your call.