How to use two different image styles on teaser? I want to use Medium image preset on teaser when the article is featured, then change to thumbnail style after. Is it clear? For example, in a cuisine recipes website I want to show a "Recipe of the Day" with a medium style image and tomorrow that recipe will be change by the newest ("Recipe of the Day") and shown with thumbnail style. Is it possible?

Thanks in advance.

Alex
You can use Entity View Modes

It will give you the chance to set up a new view mode and change it from Manage Display page.
You can create 2 view modes, one for Sticky e one for Recipes of the day.
From views page, open the sticky display, click on "Show -> Content > YOUR_VIEW_MODE" and repeat it for the Recipes of the day display/view.

In the manage display page you can set up the image style for the View Mode.