From the artist's description.

I drew this little number during my Applejack Themed Stream on my Birthday.

I think I've drawn enough Fluttershy for a while, so now I am going to focus my artistic efforts into bringing one of my favorite characters into the spotlight. I have neglected Applejack beyond belief lately, and that's not fair of me to do. Applejack is, as I've said before, a great character, and I think it's time I start giving her some attention. Even if my attention comes wrapped in leather clothing and whips. Seriously, I think we haven't seen the last of skin-tight-leather boots Applejack in my art. This is the first of many.

I also made a sketch of Applejack inside a pie tin, for Pie Day and all that, and that will come in later. Until then, I hope you all enjoy this picture.