One accessory I find is critical is a photography light tent like the one above. These can be purchased for around $50 at Amazon.com. The picture below is an example of a project I shot using my light tent. Notice how the photo really stands out from the background. There is no clutter in the picture. It's lit well and in focus. I also like to sit the project on a piece of glass to get the nice reflection under the project.
The photographer for Scroll Saw Woodworking and Crafts magazine has a series of tutorial videos that will give you the knowledge you need to take perfect photos of your projects. I encourage you to take advantage of his knowledge of photography. Check out his video series and you will have the ability to improve your online sales.