After sewing the lining in the curtain, you can see I had a few bulky layers where the top met the middle piece of the curtain.

The layers were visible at the edge of the curtain even from the front.

So I tucked it in and hand stitched the layers to the front.

Now the layers don't show on the edge of the curtain. Much cleaner.
(Excuse the blurriness, I couldn't seem to hold the camera steady with one hand.)
I still have the lining to sew on the other blue curtain and I'm still waiting for my shipment of fabric for the bottom edge. But I'm still making progress...