I did a OBW with fabric that did not have a lot of variation in, I believe the term is, tone. The gradient is not as pronounced. It does make it more difficult to lay out. But you have done a great job. The only thing I'm seeing is a bit of a medium shade in the bottom to the right of the middle. Hard to describe. I also sewed in rows. Make sure you pick up the pieces in the correct order! It isn't easy but it will be beautiful!