Shucks.
Dark wildtypes happen. You can't have 'half wildtype, half melanoid', as these are two totally different genes. That's as if saying someone is half blond haired, and half blue eyed. It's not how it works.
I've found that the ring around the eyes shows up at certain angles. If you take a flashlight (torch), and shine it at them, and move it around to certain angles, you may be able to see it more clearly.
And yes, females can retain sperm. I've heard of Salamandra retaining sperm for years. Axolotls can retain it for days/weeks.