Help me Anatomy!

[Markdotea]

http://postimage.org/image/wo095dx6t/
(Link to the picture)

Hey Guys, I'm remaking an old character of mine, and I started sketching the ideas, I cleaned the lines a bit, but I don't know if the anatomy is right or the muscles are believable enough! I intend to paint it inspired by that game "Trine", I love the color scheme and I'd like to try something like that! Well, if u guys could help me to make my artwork better I'd be trully glad!