........ Why couldn't FE8 look this beautiful? Kudos.
Re:Eirika recolor, it seems like her armor suffers from the same problem that her hair did. In her art, it looks shiny and ivory-ish, but in the portrait it's downright yellow. As for the hair... I think that IS just wanted a blue-haired protagonist.
The thing that might be off about Vanessa's face is that the shading looks dramatic and has a lot of contrast, but that's more or less the FE8 style. I'm a fan of your hair spriting.