@fajita ... You dont want to see me prototypes really you dont!
This one really has to do with accuracy of the measurements and also placing the diamonds and triangles correctly ...
Theres nothing wrong with your block per se, but its a bit odd that out of the 6 background fabric triangles you chose to cut 4 in tumbling block fabrics ... it slightly spoils the illusion of 3 blocks standing on their own a bit ...
But as I always say ... its your block, your quilt, your design ... Didnt you make this wonderful creation one year ???