Railgun (not complete)

I'm quite new for this skin making thing,
My love for this character ”Misaka Mikoto”, made me to give it a try.
and I tried to built her with the lux skin, and this is a first vision for it.

I'm having some problems here that I cant change the obj file back to the skn file.

Mot very good at this maya software, since it's the frist time i ever used it.

I'm hope that anyone could give me any advice. To make a better work on this.

If anyone is really good at this, really pleased that if you can built this character. and , I could to try to make a series of her in different custom.