I think the first part (pic) of the gradation is lovely. It's very soft, but there are value and color contrasts.
The 2nd part needs some ....depth. The last 5 or 6 fabrics (while lovely) are very close in value. The 3rd thru 5th from the end are really close in value and color, and sort of ...grey-ish. That's the part I'd rework. Keep that dark navy, but find a stronger, deeper browns and/or dark values for the end part of that run.
I love the blue/brown combo, in all values. Very classic.
Edited to add:
Look at the picture in the book - se ehow the darkest navy is next to the lightest. That's what makes it pop. If you take your last fabric next to the lightest, and compare it to the navy (2nd from end) with the lightest, the light will pop better with the navy. An even darker brown will make it sparkle.