Very good!

It just takes time.  Some submissions can take up to a couple weeks to make it into the gallery depending on how many patrons are making it through the public queue to vote.  If you're worried it won't get entered into the gallery by the time of the contest closes, you might message Mandrill and make sure you submitted it for the contest correctly and, most cases, he can push your piece through.  That only works when you've got a contest entry though.  If it's just a personal piece, you'll just have to wait.  But patience gives you time to work on more pixels!  

oh..thank you man !! :D ..
but why the my pixel not approved ?? :(
 

I can see the improvement the anatomy and animation for sure.  I kind of like the way the original has segments in the character's body, but the separation of them was a bit rough.  The animation here it's a lot smoother, but the way the arm compresses just looks like the transform tool was utilized.  That's not always a bad thing, but here it sorta rubberizes the arm.  

Still, you've improved a lot!  Keep up the great improvement.