Creating a decent product image of your products is an art unto itself. Considering the size of the IMVU catalog, and the visual clutter created by so many developers competing for the attention of members, there are some things to think about when you are creating your own product image.
This is not a ton of real estate to work with, but it does give shoppers a chance to preview your creation before clicking to find out more. You can take a screenshot of your product in an environment, or just on a neutral background.
What is most important is that your product read clearly, even in this postage stamp sized format. You will have a lot more room to show off your glorious product on the product description page, but for now you want to catch the eye of shoppers scanning the catalog. You also want to make sure they can clearly see what it is they are looking at.
Another thing you may want to include in your product screenshot is your own logo or a visual element that ties all of your products together.
There is also a lot of potential for your catalog snapshot to tie into the graphics you use to visually describe your product within the product description page itself.