I shall only point out the obvious, for now:

1. Eyes are not true to OotS. That may be one reason.

2. Body width must be less than head width.

3. Linework: Make your lines consistent. Thick enough that they look like arms, butn ot so much that they look fat and out of proportion.

4. Outlines. Much like the linework in arms and legs, the outline should be wide enough that it looks stylish, but not so much that it looks ugly.