We use A4 papers everyday in our business lives. Stationeries, posters, letterhead are just some of the ways we use A4 papers. To however make sure your designs come out great, you need to use mockups, and we have a particularly awesome A4 paper mockup for you. It features a handheld A4 paper in PSD format, making it very realistic. All you have to do is place your design or text to have a great presentation of your designs.
Thanks to Graphic Burger for the constant supply of amazing mockups. Browse through their website for more mockups.