Are shadows as simple as the sun + an obstacle? Doubt it! As a creative, you should be aware of how hard yet important it is to add realism to your work, and there's no better way to do it than to add a shadow!
Fine, if it accompanies a mockup or a scene you've got already, but if not, you can easily add it yourself with our unbeatable time-saving tool use one of 16 predefined directions or set your own manually, customize length and softness and be delighted with the image you get. Do it for the first time in your life don't fear and check the tutorial, it is to help! Finally, you'll get your work 100% complete and impressing is there anything else you, a designer, may strive for?