I was a voracious reader as a kid, and thus actually read the manuals of my games. And thus I knew Sonic's sidekick was a little dude. A Robin to his Batman as it were. I never assumed that the brightly colored little fox was a little girl. Others did for some reason and were never dissuaded from this notion until talking with other fans much later.

Took a cue from another artist's rendition of a female Tails and made her a bit more stacked and curvy than you would probably see.

As a further note, I should ave made the tails bushier. Aw well.