One easy way to blow your clients away is to stop emailing them simple jpgs of whatever you’ve created. Instead, throw the jpgs on a nice background, toss in their company logo and spend a few minutes creating a quick writeup for each concept. Present your thought process and logic behind everything you create. You’d be surprised how few designers put in this extra effort and how impressed many clients will be with it.
Beyond simply making a good impression, this technique helps you sell your ideas to your clients. A simple static thumbnail leaves a lot of interpretation hanging in the balance. This could result in a complete misunderstanding of what you were trying to accomplish and ultimately an unchangeable dislike for your design. However, if they see that you’ve thought through the concept, they’re more likely to accept the design or at least make suggestions without destroying the integrity of the idea.