I think an eye for design is something many just 'have'. the ability to pick shapes, colours and imagery which flow can be quite instinctive. You can improve with practice though. I find mimicking/copying to be a constructive learning process at first. Find a peice of work that impresses you and is quite clearly technically advanced and try to replicate it. the process might involve following online tutorials, posing questions to other designers and simply playing around with tools and techniques. All of these things will teach you a LOT and hopefully you will develop a style of your own along the way.