at the very least i would expect the quilter to state at the beginning of her 'gallery' that the pictured quilts are customer quilts, quilted by her...that seems like the way it should be, but also, she should ask her customers if they would mind if she put their quilts in her on-line gallery.
i always take pictures of quilts i have quilted for people but the only people who ever see those pictures are the customer. i send a picture to the owner showing the finished work so i can get paid :)
and i even save the pictures so i can go look and see what i did on certain ones. i would never post a picture of someone elses quilt without them actually telling me they would like me to.