For hair in particular, practically everything that isn't a real-life hair color gets lumped under "Multicolored/Dyed", which kind of feels a bit too broad and makes it hard to find things. It would be nice if some extra hair colors (blue, green, etc) could be added so that category can be reserved exclusively for the ACTUAL instances of multicolored/dyed hair and not just fifty million fictional characters with green/blue/purple/etc hair.
Also, a heterochromia option for eye colors would be nice, since I know there's like. One or two actors out there with it and it would be nice to easily find them.