Nice, but there's plenty of room for improvement!
Why so many colors? > 256... All characters have different skin and hair tones; 12 different blues in the sky...
You should really try working with a palette, or use an existing one like the previous challenge, or these.
The grass platforms could use more attention: smoother lines, better lighting, textures. There's no reason that they look so different.
However, I like your style!
Nice, but when such large pixel art peices use large areas of solid color and crisp edges as this they end up looking like vector art with anti-aliasing accidentilly turned off.
@ manupix: thank tou very much for your advice,comment and also the link^^,it is very precious to me...lets keep practice harder^^
@ mathias: thanks for the comment^^.....ooosh!!