wow ! very nice !! :)

The animation is so smooth but the book not moving a single pixel is taking away the realism. Also I would make his mouth move a little like he's mumbling.

 it's a nice piece but I think it's undone by the static elements of the character.  one of the definint qualities of syosa's animations is that nearly everything is redrawn each frame, even only a pixel or two changes.  but even if we disregard the intention of learning from his work, it's a good practice in general - the arm and book and knees are extremely distracting, which is why they need to be shifting, if only slightly, to keep with the movement of the rest of the body.

I like his expression. Is he trying to memorize something?

Not sure about the open shirt (clothes in general) and hair style accorded to Syosa style. It may lack of the right atmosphere to fit his style. Disregarding this point, it's a very nice pixel art. 

 Very melancholic.

I agree about the palette, but this is still lovable.

 I think you have to make use of selective outlining, especially on hair.

That was the first thing i noticed that differs from Syosa. I also think that Syosa's shadows are a little more reddish, and the overall palette have more green.

But i understood immediately you were imitating Syosa, so the piece is a nice imitation, and I really like the animation!

 The colors still seem a bit dark for syosa, however the animation does help quite a bit with the style. I think it would be acceptable to keep the character's palette, but brighten up the background colors. Make some contrast between the characters clothes in the background! And btw, the head is perfect :D

Is it better now?

 The pixeling itself is similar to Syosa's, however the palette doesn't seem similar to his palettes. This palette feels too dark and lacks the normal purple base that Syosa uses. Nice pixeling though!