In a human form rainbow hair on humans is for clwon wigs given here
personlty soild red deep like fire works
and i would constrast her human with her pony form by making her human form in more realistict like marvel or dc comics i like anime eyery one human ponies dose it in a anime style
an athleta lik dash havle much much shorter hair for less drag
some muscle mass and here wings cholor mach that of a perigen falcaons becuse they are the fastest type of birds in our world and steal blue eyes

but all inall its good