Unless you've signed some watertight contract you should be able to display projects on your website.

Designers need to show recent commercial work in order to build up their portfolio and its not unreasonable to do so.

The old adage: “Its better to beg for forgiveness than to ask permission” is a good one to go by.

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• its good practice to wait until the commercial/movie/tv show/event has already aired or has been shown.
• you attribute the studio and/or principal crew on the project, ideally with a link back to the studio and/or principal crew
• state what role you played on the project.