I'm a little bit late with discovering this, but I've just created my characters in Unreal Engine using MetaHuman Creator and it's really helped me with knowing what they look like and I'm sure it'll help me out with descriptions later on! One of my characters below! She's a frequent eye-roller.

You'll need an Epic Games Store login to access it. Easy enough to create and then you may lose hours sculpting faces.

Also note, it's in Early Access, so there's not a huge range of hairstyles/clothing but for the sculpting of the actual look and feel, it works really well!

https://metahuman.unrealengine.com/