I think it's based on the general animal. I'll take a picture of my coral glow later, he's getting super speckly (I also love the speckles) and he's still I guess around 7 months old. I actually think his dad was a black pastel but it wasn't visual? If I remember correctly. Not sure if that's relevant (I'm not great with snake genetics).
Totally agree with Kroberts10 about the faces too, such cute faces. I think though I have a predisposition. I love my snake haha.