Can I use Drupal image styles?

Yes. Acquia Cohesion image and picture elements make use of Drupal image styles.

The Acquia Cohesion image and picture elements make use of Drupal image styles. You can create your image styles as you would normally and then select them for use in the image or picture element. You can also use Drupal image styles for background images within styles. For more more information, see Background image and gradient properties.