Bravo, for getting up the courage to post a design, keep them coming. Aren't dark suedes a PIA when it comes time to remove flumbs? They look great, but those flumbs sometimes make me want to pull out what little hair I have left. A good tip there is to use a lint roller.
My observations, since you asked.
1. I would vary the reveal more on layers 2 & 3, they are to much the same size and create a distraction in viewing that way.
2. The top mat and second mat are both so dark, that if I were going to use them next to each other, I would either have not reversed beveled the suede, or if I did I would have used a spacer between level 1 & 2 to offer some definition.
2A. I think my choice would have been to reverse layers 2 & 3 , and then only show approx. 1/8" of layer 3.
Let's see some more.