Re:How to cross-wiki images? 

Good news for you: since all the images at the Spanish wikipedia are placed in commons:. there is no need to cross reference them, you just use them! Just be careful to change Imagen with Image.

A not though on the naming of the articles. Except for provincial capitals, the default convention is to name cities and towns with their name only. If there is an ambiguity (e.i. Carlos Pellegrini is also a former-president), then you add the Province's name after a comma:
Carlos Pellegrini, Santa Fe.

If you wish, you can use the City Templates we commonly use in Argentine cities; check Rosario for the full use of the templates.

Don't hassitate to contact me if you have any other doubts. Good wiking, (t/c)