[Wikipedia-l] interlingual use of image

[Tomos at Wikipedia]

As I understand, there are two ways to use an image from another 
language-wikipedia.

One is to download it (say, from Meta) and upload (say, to Japanese).

The other is to use the URL of the image. like this: 
http://meta.wikipedia.org/upload/c/c0/Japan_global_locator_closeup.png

Is one way more recommended than the other? Is there any discussion of 
sharing or not sharing images across language-wikis? I see that the first 
takes more storage capacity, while the latter may cause more burden on the 
server when a page is downloaded (though I'm not sure).

Thanks for help,

Tomos

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