I figuratively kicked myself when I missed the He-She challenge, since I had the perfect idea for it. So I was thrilled when Clean your Hard Drive came up.

I'm among those who mistook Zero for female at first sight, when I played Mega Man X over a decade ago. The sprite was inspired by a sprite comic titled "The Other Side", which features a female Zero:

http://www.boomspeed.com/kieran/

I attempted to mimic the style of the large sprites of Mega Man X4, which seemed extremely fitting. If you'd like to compare it with the official sprites, you can check this page:

http://www.sprites-inc.co.uk/files/X/X4/Mugshots/

I would've liked to come up with a fancy background for the mugshot, but the He-She challenge limited the palette to 16 colors, so I have to leave it blank... In fact, sharing the same colors between the full body sprite and the mugshot was difficult enough.