This is my first vector attempt. It is taken from Pinkie Pies pose in The Crystal Empire Part 1 at about 07:30, using an old YouTube 1080p rip at the time I started. I spent about eight hours, distributed over the past week and concluding with some final touch-ups before uploading here. I used Adobe Illustrator CS5, but my next vector will be attempted with Inkscape, instead.
 
Update: Sorry, as one commenter pointed out, she looked kinda like a mouse. Thats because I made the teeth too large. Im updating and merging so I can sleep better tonight. If you liked the larger-teeth one better, though, I have a backup of it.
 
Update 2: I went back and cleaned it up a bit referencing a 1080p screenshot and recolored it via guide.