She doesn't have green eyes - only Albus does, the epilogue says. I think she has Ginny's hair.

^Yeah but we can headcanon ^^; and yeah i wish she had light brown eyes (like a mix from Harry's green and Ginny's brown) and that her hair was straight and reddish or auburn (i have a lot of headcanons/fantasies on how the next gen kids look like )

I thought the term "head-canon" meant stuff which isn't canon but doesn't contradict canon. Sort of halfway between canon and fanon.

Also slightly wondering why there isn't every option, e.g. you have dark red with blue, but other shades of red with green and browns.

^Yeah ^^; i mean we only knew that Albus had green eyes and Lily and Rose had ginger hair right? And everything else about the kids can be headcanons since we don't know what happens and we can make it up o our own (Until JK decides to make a sequel ^^; )
And well i left a add more opitons one since anyone can add whatever shade and eye color he wants ... ^^;

I thought we knew Albus and James had dark hair *shrugs*

The adding more options thing doesn't appear for me.
Edit: it does if I cancel my vote. Never mind. It only assumes that I wouldn't want to add an option when I've already voted.