Any time you willing to use images, or animation graphics in, or around your content information, or products descriptions try to use as small images as possible. Also, refrain from using too many images on any one page because both larges images and too many would considerably slow down the loading time for the website. You need to remember that your visitor would only wait for about 30 -40 seconds for a page to load before they become impatient and goes for another search.
Using image resize tool for uploaded images is a good idea to resize bigger or smaller images. These tools are adequate for most resizing requirements; however, extreme resizing from very large to very small image or vice versa could be a bad idea because it may result in loss of some detail in the image. One can obtain better result if you resize them first using a quality image-editing program on your computer and then go for uploading your websites.
It is good idea to break up your products into various groups within your catalog to help your pages from being affected by too many images. Even if you sell only one type of products but you have 50 variations of it, you could still use multiple pages by organizing them into categories; for example "Product 1", "Product 2" and etc.
Lastly, there are various things you could add to your website to spark it up. Things like banners, flashing or graphics, animations or colored text, etc. There's a saying when it comes to web designing world that is, "Just because you could add something, it doesn't mean that you should." Remember as you choose items to put on your site and it would in-turn help you to keep your website looking professional.
