the left thigh seems bigger than the right one, so try evening them out next time. to be blunt, the face and body proportions need some work and if you're using sai, the ink pen tool should be used for lineart, anything thats best for you can be used for coloring, and the marker is recommended for shading. if you dont have sai, i can send you the program through skype if you want. its a really simple program that provides all the tools you'd need
everything else is really cute though, i can help you out with highlights and shading if you'd like