I'm certainly not very experienced, but it "feels" a little unbalanced to me. I think I'd rearrange the squares so when squinting, the darks either flow out from the center or frame a lighter center, or have alternating rows of light to dark, then dark to light. The yellows might work better then, but they do seem a bit distracting in this layout.
Neat fabrics, though. I think I'd like the polka dot as a binding.