You might not need a wig, but making your hair darker and styling it is a must. Her hair seems to have very high and sharp curls, you might need to cut your hair a tiny bit. Lift your hair with a bumper, that will make a big difference; also have those long side piece of hair, curled at the ends.
It is kind of hard to pin point this as anything other then just steampunk fashion rather then a character. The shirt needs to be the right dark orange and stripes, the white makes it seem too generic. Also a skirt would make it easier to tell apart, pants looks to generic as well. No offense to you personally, but a good padded, fitted bra will help as well with the overall effect.
You also need a lot more makeup for more dramatic effect, sharpen your eyebrows to be more narrow and slanted.
It's a great job so far, just hard to recognize.