If you are looking at quilts from different sources, are they all lit the same?
A strong side-light, from a single direction, is preferred to highlight the quilt stitching. A window in the early morning or late evening provides such light. Many of the long arm quilters on the board take side-lit photos to emphasize the work that they do. Conversely, having multiple even, broad sources of light makes the stitching difficult to see so the pieced pattern gets more attention. An outdoor photo at mid-day with the quilt laying down flat can make the stitching almost disappear.
When possible, I like to take some photographs with even light and some with side light to show both types of work.