This stems from the talented 's comic strip. I would suggest that you all start following him stat! He's good at what he does.
I used kturtle's color sheet - as compiled by ~EnnervateIndustries here on dA - for reference.
This is dedicated to . ^^
PSD vector file iz over here. If you use it, please credit Decoy (and maybe me?)!
This Trixie face is priceless and
My Little Pony - FiM © Hasbro,
Trixie's obnoxiousness © Dave Polski, Mitch
Lineart by *Evil-DeC0Y
Made in Adobe Photoshop CS4
I always look at good art and say, 'Why, oh why, does our computer only have Microsoft Paint for art.'
I love silly Trixie. And when she trips over herself. She's just too adorable.
If you're willing to trace FiM stuff specifically, you can use 's guides. Also, choose a software to use (Photoshop, Inkscape, Illustrator...) and stick to that one until you master it.
And finally, post your work and don't be afraid of taking criticism; that really helps a lot in your work. Don't be ever discouraged and do what you feel like doing.
I have Photoshop, but I do not know the first step to vectoring, well-
Oh well, perhaps some tutorials will help. Or perhaps not.