Overall, I can grade this as an excellent picture displaying a character's powerful poses.
For vision, it is safe to say that there was a bit in here. Most of these movements greatly compliment Applejack's strongest physical capabilities, but one thing I would have expected is seeing some kind of running motion, for even more diversity. Still, it is very comprehensive nonetheless and has enough diversity in what it is trying to show.
For originality, I don't think this point really matters in this kind of example. Unless these images rips off another completely, I see it as a moot point. I believe vision and technique is a lot more important for posing. Plus, even if this is very much based on One piece's Sanji, I can only see a few small resemblances towards one or two of his signature kicks, other than that all I see are just poses for attacks which are taken very differently from the source material. Some of you may argue this is a bad way to cover the critique since originality is a must in art, but you should also understand the difference between what is essentially Original art vs. Fan art, of which this was always meant to be simply fan art. If it is based off MLP:FIM characters, why would you have a problem now that two characters from different cartoon shows share traits, in an attempt to interpret one character? I certainly have no problem with this, I actually love that two great characters, Sanji and Applejack, share things in common with each other and are used together in this.
The technique is something that is very impressive though and it does show a great deal of details for each pose and making it work. Seeing so much detail on just something as simple as the clothing is exactly what gives the pose a more defined and powerful impact. Without it, I couldn't see this working as well as it did here. The only slight of critique I will have to offer here though is in the centre of the picture, which I assume is Rainbow Dash. The problem stands in that it clashes with how much details it is lacking, but luckily it is at a far distance from the others and for that, I can pass this one.
Lastly, the impact of this is quite obvious very strong, due to how much power there is in each depiction. The impact is also even more powerful due to how much more detailed and refined everything looks in comparison to previous works, so I suppose it would be only fair that be considered as well in this critique. I was quite honestly surprised the moment I've seen this picture and I have to say, some of these drawings are really amazing looking at them even now.