I don't know much about fencing, but... this looks odd to me. The one where he's standing upright is amazing. Very iconic, very cool. The ones with the swords look odd.
His stance looks like he's in the middle of combat, almost. His legs are spread far apart, like a fencer. But his hands are down by his sides, and the sword looks more like an afterthought rather than his focus. If you remove the sword, it looks just as natural as with the sword. He's holding it so low, so far behind himself, that it almost looks like he's holding a club.
I suppose it would make a bit more sense if he was wearing armour and holding a shield, because then you don't rely on the sword so much for defense, and you rely more on brute force than finesse and speed. But this dude is wearing green panties.
It's not wrong, it just doesn't make sense to me. It doesn't look like anything I've seen in fencing. Doesn't look like
this or like
this. I'm biased though, I'm a sucker for realism in fighting games. But hell, even the original Prince of Persia had some realism. And the Prince wasn't holding his sword like this.
On a purely artsy note, perhaps it should be more clear where the knee is, especially on the leg that is fairly straight.