Your pictures will be much better if you take them straight on, rather than at an angle. Do whatever it takes to put the item on a wall and stand in front of it. Photographing it from a tabletop or the floor makes the sides of your quilt angle in toward the top. Take your picture with good natural light, but not direct sunlight.
At left, I stood on the floor; at right, I was standing on a chair. In
both cases, the perspective is skewed and you cannot clearly see the top of
the quilt.
Some graphics software allows you to correct your pictures if they are not straight. However, it is not perfect, as shown below.

Using the perspective correction tool in Paint Shop Pro

The end result is straight but not in the correct proportions and the detail
is lost
Here is the same quilt on the wall with the same lighting it had while laying on the table. You can see the details.
Incandescent lightbulbs cast a yellow light. New compact fluorescent lightbulbs can be white or natural and will give better results.
Quilt on left was taken with incandescent bulb; on right, a fluorescent bulb
gives true color results
Place your quilt on a wall, rather than having someone hold it. Your quilt will not sag or have little fingers and feet attached to it.
If you do not have a wall, you can pin your quilt to curtains. You must do this at night when no light is coming through the curtains and you must pin the top in the center as well as on the ends. The picture below shows what happens when you pin only the ends and there is light coming in the window.
Every seam shows through when there is light and the center is sagging