By default, your orders are fulfilled automatically, but you can choose to manually approve each of your orders. When someone orders your products with automatic order approval, the order is immediately forwarded to the lab. When someone orders your digital products with automatic order approval, the digital copies of your photos are automatically prepared in the correct resolutions and an e-mail with download link is sent to the customer.
With manual order approval, your customers receive a pending approval e-mail and the orders are held for up to 7 days. During this time, you can replace your images with higher quality copies if necessary, review the order, and check and correct the cropping for prints. If you for any reason cannot review an order within 7 days, the order is approved automatically so as to prevent your customers from waiting too long.
You can enable the manual order approval for either products, digital downloads, or both simply by going to "Settings" >> "Control Panel" >> "Selling".
What can I do next? You may want to take a look at price list creation and you might be interested in cart sharing as a method of reviewing your customers carts before the order is placed - to minimize their waiting time.