Gah so adorable <33 owo

I notice that this piece is open for critique, so I hope you don't mind one!
It's best not to start out with the anime style and practice anatomy and proportion. http://posemaniacs.com and http://artists.pixelovely.com/practice-tools/figure-drawing/ offer great practice for figures.

Her head is very large in comparison to her body- judging by the hairline the hair is either really poofy or the forehead is very tall. The shoulder on our left is also wider than the one on our right. The breasts are also VERY high. They rest on the ribs, not the collarbones. They also have gravity and sag a little. To help with proportions with arms as well, a good tip I have remembered is that the wrists line up with the crotch area.

I've done a quick redline that may be helpful even though I'm no expert: http://i.imgur.com/wCGYUuN.png

There also doesn't seem to be a definite light source. It's very scattered. Here are some tutorials on light source and color:
http://thepurplesorcerer.deviantart.com/art/Light-Source-Tutorial-319616140
http://www.deviantart.com/art/A-Note-on-Light-and-Colour-93113938
http://www.deviantart.com/art/Tutorial-Light-Shading-Reflect-26163054

Hope this helps!