rather rough edit
to illustrate the proportions you had can be fine if you work on it, it's a style choice so I wouldn't recommend changing the proportions that drastically if that's not what you wanted to achieve.
and PixelPiledriver's edit has alot of good principles, you'll notice he kept similar proportions, but notice he enlarged the character to allow more pixels to refine the features, and that's a good piece of advice, it's difficult to capture the right curves and to define features at lower sizes. also I recommend finding and using some reliable reference on the sword holding hand, at the moment the hand is incredibly awkward, and PP has illustrated an effective approach more dynamic and easier to execute because you do not need to worry about fingers, and the resulting angle of the sword is more dynamic, but in some senses it is a bit more difficult to render the dagger at that angle, notice his use of colours to reinforce the tilt/angle
big step up on the shading compared to the first attempt, I think the hair needs a bit off work too, looks like short hair and a ponytail and doesn't quite match, I didn't offer any visual suggestions in my edit but PPs edit again is good reference. the non pony tail hair is mostly bangs and establishing the hair is flowing toward the pony tail
keep persevering
