When creating images on Reve the image count will automatically default to 4, but you can customize this as you need.
Selecting an image count
To update from Auto, click Custom in the chat interface and then Count. Select your new count setting, choosing between 1, 2, 4 and 8. This will apply to all future generations on Reve. You can update it again at any time.
Pro tip: You can also specify the number of images you want directly in chat. If this is different from your custom setting, Reve will follow your current directions for that generation.