Here is an example of before and after previews from another kit.

This preview was done by Picture Perfect and you can see the dramatic difference.So if you are just not feeling your previews and do not think they justify the work you do then perhaps rather then fighting to come up with something you are happy with and losing time you could be creating you should consider having them done for you and done well.

You can see the difference of placement and composition and how it can enhance your work and truly make a difference in your sales. First appearance is all you have in attracting customers to your designs and if you lose that chance then you also lose money and that's not a good thing.