Oooooo!!! I love it!! It looks great and the whole quilt will be stunning.
Your work looks perfect to me - so I am not sure you need suggestions - lol - but I am a big fan of paper piecing and have done a couple of curved pieces and this is what worked for me. On the projects I did, the pieces that were where your pretty floral print in the corner is and the center pink (or red??) I cut larger in all directions. I am a pinner, so I marked the exact ends, center and quarter points and the extra fabric at the ends gave me some extra wiggle room as I usually start pinning at the center of the curve and work out in both directions. Once sewn I put a large square on the two corners and squared it up.
Can not wait to see the finished quilt