Nice tank top. Necklines can be tricky. If you have extra fabric you could line it.
I don't have any extra fabric, I was squeezing this top of what I had. The neckline would probably look better if I pressed it.... there's a small facing there. It's possible that the silk + interfacing combo is making the neckline wrinkled and unhappy there. The silk is pretty thin, maybe I needed lighter interfacing.