Adsense ads -v- pictures in layout

I have a website with a standard header, three-columns, footer layout.
The right and left columns are dedicated to navigation, meta information, search, etc.

The main content, naturally, is located in the middle column which is about 560 to 600px wide.

So here’s my problem: each article has a lovely photo to go with it, placed at the start of the article, just next to or under the title.

At the same time I want to show adsense ads in the article itself, preferably a large square near the top. But the adsense ads competes with the photo, and there’s not much room for text left over…

So, how do I do that? What is the best layout scenario?