Adsense placement in a blog-like news site

Hi.
I have a site, www.enelsubte.com. It's a news site with a blog structure about the subway in Buenos Aires, where it is called "subte" (from "subterraneo", underground).

The actual placement is:

Frontpage: a 468x60 ad under the main image.

Inside page: a 468x60 ad between the description of the article and the body.
Another 468x60 ad between the end of the body and the comments.

Do you think this is a good placement? Do you have any suggestions?

Thank you!!

 

placement and colours are ok but using bigger ads may give better results

 

design looks nice, but i don't speak spanish so i can't read it...but looks nice...